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get a 100% Free Cold Email Toolkit!
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How Do I Get Off Microsoft Blacklist & Prevent Future Blocks?
How Do I Get Off Microsoft Blacklist & Prevent Future Blocks?
How Do I Get Off Microsoft Blacklist & Prevent Future Blocks?
Deliverability
Deliverability
Deliverability
Mar 18, 2025
No one wants to be on a blacklist. The very name conjures up unsavory associations, and in the case of email, it can disrupt operations, damage the sender's reputation, and hurt business. If your email infrastructure is not up to par, it can happen overnight without warning. Understanding the Microsoft blacklist and how to get off, it can help reduce the stress of such an occurrence and ensure that you can quickly restore email operations. This article will cover how to get off the Microsoft blacklist, fix email reputation, avoid future blocks, and maintain an email infrastructure that will protect your deliverability and sender reputation.
Inframail’s email infrastructure solution can help you achieve these objectives. Our tools will help you quickly get off the Microsoft blacklist and ensure smoother email operations in the future.
Table of Contents
Does Microsoft Have a Blacklist?
Microsoft maintains its internal blacklists, which are used to reject emails coming from specific IP addresses. Microsoft also blacklists any IPs listed on the Spamhaus blacklist. As far as we know, this is the only external (DNS-based) blacklist that Microsoft uses. The rest of the blacklisted IPs are based on Microsoft’s criteria. These listings are not very transparent and include many false positives, as Microsoft will often list more extensive ranges.
There are Two Distinct Blacklists That Microsoft Uses
Each for different platforms. One is for OLC (Outlook Consumer), which is used by outlook.com, hotmail.com, live.com, and msn.com. The other is for Office365. If you receive an error message from Microsoft when sending emails, please check the error message to find out which blacklist the IP is on. Please make sure your server isn’t sending any spam and that your IP isn’t listed on any DNS-based blacklists. Please also ensure your emails comply with Microsoft's policies, practices, and guidelines, which can be found on their website: https://postmaster.live.com/pm/policies.aspx.
What Causes Microsoft to Blacklist My IP Address?
Before diving into the solution, here is a quick recap of the multiple reasons why Microsoft might be blacklisting your IP address. Microsoft’s servers will mark your communications as spam. Doing this persistently can get your IPs blacklisted. If your users find your email messages unhelpful, they may mark them as spam. This alerts Microsoft servers to treat your IP with caution.
Understanding Email Blacklisting and How to Avoid It
Persistence may earn you a blacklist entry. You may still get blacklisted after practicing good marketing hygiene if the settings of your DNS are misconfigured. If your emails are experiencing higher bounce rates, Microsoft may blacklist your IP. If your IP is forwarding an uncommonly high volume of emails to Outlook or Hotmail users, Microsoft can consider this as a red flag and blacklist you. Blacklisting is also a result of working with servers and IPs that have a bad reputation. Knowing these reasons makes it easier to understand why your email marketing isn’t performing as it should be. This is your first step in checking for the probable causes for blacklisting and IP blacklist removal.
Related Reading
• Blacklist Removal
• IP Address Reputation
• Blacklisted Email
How Do I Get Off Microsoft Blacklist?
Before you begin your IP blacklist removal process, you need to ascertain whether Microsoft has indeed banned your IP. It is a simple process. Suppose you know your mail servers are sending emails to Microsoft 365/Hotmail users. In that case, a blacklisted IP will be denied deliverability by Microsoft screening and return an error message to your inbox. The error message will look something like this: 550 5.7.511 Access denied, banned sender[xxx.xxx.xxx.xxx]. To request removal from this list, forward this message to delist@messaging.microsoft.com. For more information, go to https://go.microsoft.com/fwlink/?LinkId=526653.
This error message indicates that your mail IP has been banned from Microsoft users. You can now proceed to the delisting process.
Two Ways to Remove an IP from Microsoft’s Blacklist
If you did everything right and followed email marketing best practices, your IP can be easily delisted by following this guide. There are two ways you can remove an IP from Microsoft’s blacklist:
By contacting Microsoft through email
By using the Microsoft delisting service
Contact Microsoft Via Email
If your business was blacklisted for sending emails to Hotmail and/or other Live domains, you can use this simple method for IP blacklist removal. Send an email to “delist@messaging.microsoft.com” You can place your request to have your IPs delisted from the Microsoft server blacklists. You will receive a response within 48 hours of sending the email; however, if it takes longer, you can resend it. Note that this method only applies if you have been mailing to Hotmail/Live domains. For all other domains, you need to adopt the second method.
Use the Microsoft Delisting Service
Microsoft’s delisting service is available for email marketers who have been wrongfully blacklisted because of some reason. It is best to ensure that cyberattacks haven’t compromised your mail servers before you fill out the delisting form. Compromised servers do get delisted but end up back on the blacklist sometime later because of suspicious activity detection by Microsoft. Once you have ascertained that your mail servers are secure, follow the steps below to remove your IP from.
Visit the Microsoft delisting portal.
Please complete the captcha code and submit the form. Microsoft will send you a confirmation email at the address you provided earlier.
You now need to open this email address and find the email from Microsoft. Check the junk or spam folders if you don’t see it in your inbox.
Open this email, and click on the “Confirm your email address” link in the mail. You will be redirected to the delisting portal when you click the link.
This window will contain the IP address of your blocked mail server. To remove this IP from the blacklist, just select the IP and click on the “Delist IP Address” button.
It takes about 24 hours for Microsoft to work on your request and remove the IP from its blacklists.
Specific Instructions for Delisting Different Microsoft IP Blacklists
1. OLC (Outlook Consumer)
If an IP is listed on the OLC blacklist, then emails from that IP will be rejected with the following error message: 550 5.7.1 messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider.
Note: Microsoft uses two error codes. S3140 means the IP is entirely blocked, while S3150 is throttled.
How to Delist an IP from Microsoft's Blacklist
To delist IPs from this blacklist, please fill out the following form: https://olcsupport.office.com/. Once you have filled out the form, you should get a response within a few hours with the results of a first automated check on the IP. In rare cases, the result of this check will be that the IP has been “Mitigated,” which means it has been delisted from the blacklist. In most cases, the result will be that “Nothing was detected to prevent your mail from reaching Outlook.com customers” or even that the IP is “Not qualified for mitigation.” Please respond to the email and provide Microsoft's requested information in those cases. When you do so, the ticket will be escalated, and an actual staff member at Microsoft will take a look at the IP. They usually manually delist the IP (“We have implemented mitigation for your IP”). If they still refuse to delist the IP, and you’ve only recently been allocated the IP, you should tell them this. They will then require an email or PDF confirmation from us, the ISP, with information on when the IP was allocated.
2. Office365
For Office365, two separate but linked blacklists result in two separate error messages.
The first error message is:
550 5.7.606 Access denied, banned sending IP [x.x.x.x]. To request removal from this list please visit https://sender.office.com/ and follow the directions. For more information, please go to http://go.microsoft.com/fwlink/?LinkID=526655 (AS16012609)
To delist IPs from this blacklist, please fill out the form linked to in the error message: https://sender.office.com/. The error message also contains a link to the workflow to get the IP delisted. If you follow the instructions, the IP should be automatically delisted.
The second error message is:
550 5.7.511 Access denied, banned sender[x.x.x.x]. To request removal from this list please forward this message to delist@microsoft.com. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(1410)
Steps to Verify and Remove Your IP from Email Blocklists
When you contact the email address mentioned in this message, you should get a reply within a few days that the IP has been delisted: The IP address you submitted has been reviewed and removed from our block lists. Please note there may be a 1-2-hour delay before this change propagates through our system. The IP might have already been delisted, resulting in the following reply: The IP you submitted is not currently listed on any of our block lists. This may be due to an earlier delisting request already being processed. If you continue to receive Non-Delivery Receipts (NDRs) or “bounce messages” that indicate that our spam filtering system still blocks the IP address, please forward one of the messages to us, and we will investigate further. In this case, please follow the instructions and forward a recent error message to delist@microsoft.com. Using the delisting form will ask you to leave some (extra) personal information. This is how to fill in the form:
Microsoft form | Your answer |
Contact name | Your name |
What domain are you sending to | example@hotmail.com or another domain such as example@outlook.com |
Contact email address | Your own email address |
What domain are you sending from | The domain you were using when you sent the (blocked) email |
What would you describe your company or yourself | Select the relevant option (many times this is ‘others’) |
Outbound IP(s) or range(s) | The IP address of your VPS |
Is your server dedicated or shared? | Your VPS is dedicated, but if your VPS is used for multiple domains, specify shared |
Copy and paste any error messages | This means, the bounced header of your email |
Provide the url of your website | www.thisisanexample.com |
Microsoft Programs to Help Manage Email Deliverability
For advanced users, it can be helpful to join two free programs that Microsoft offers for OLC (not Office365): the Smart Network Data Services (SNDS) and the Junk Email Reporting program (JMRP). Neither the SNDS nor the JMRP allows you to delist your IP; they simply provide detailed information about the traffic on your sending IP, the sending IP's reputation with Microsoft, and the user complaint rates. As Microsoft says, there is no silver bullet to maintaining or improving a good IP reputation. Still, these programs help you proactively manage your email eco-system to help ensure better deliverability to Microsoft users.
SNDS
This program allows you to monitor the “health” and reputation of your registered IPs by providing data about traffic, such as mail volume and complaint rates originating from your IPs. This data is only offered to IPs that send more than 100 emails per day to Microsoft OLC accounts.
To register, please visit: https://sendersupport.olc.protection.outlook.com/snds/
You must request authorization for the IPs you would like access to. Microsoft uses a combination of WHOIS and rDNS to check who the owner of a particular IP is. In some cases, you can send an email to your domain to verify ownership.
JMRP
This is similar to a feedback loop (FBL) in that it will send you a copy of an email marked as “junk” by the recipient. However, to prevent listwashing, the JMRP will only send a copy of about one out of every 1,000 emails marked as junk. This limits the JMRP's usefulness, meaning many senders get little to no complaints via JMRP, even though recipients mark their emails as junk. You will first need to be authorized for the IP in the SNDS (see above) before creating a feed for it in the JMRP.
Related Reading
• How to Improve IP Reputation
• Google Blacklist Removal
• Blacklist Removal Tool
Start Buying Domains Now and Setup Your Email Infrastructure Today
Inframail helps agencies, recruiters, and sales development representatives scale cold email outreach with unlimited inboxes at a flat rate. With automated technical setup, dedicated IP addresses, and Microsoft-backed deliverability, Inframail is revolutionizing cold email infrastructure so users can focus on reaching prospects instead of wrestling with email configurations.
How Can Inframail Help Me Achieve Better Email Deliverability?
Inframail provides automated SPF, DKIM, and DMARC setup to help you achieve better email deliverability and sender reputation. The higher your email deliverability rates, the more prospects you reach.
Related Reading
• Remove Domain from Blacklist
• Check if Email Is on Blacklist
No one wants to be on a blacklist. The very name conjures up unsavory associations, and in the case of email, it can disrupt operations, damage the sender's reputation, and hurt business. If your email infrastructure is not up to par, it can happen overnight without warning. Understanding the Microsoft blacklist and how to get off, it can help reduce the stress of such an occurrence and ensure that you can quickly restore email operations. This article will cover how to get off the Microsoft blacklist, fix email reputation, avoid future blocks, and maintain an email infrastructure that will protect your deliverability and sender reputation.
Inframail’s email infrastructure solution can help you achieve these objectives. Our tools will help you quickly get off the Microsoft blacklist and ensure smoother email operations in the future.
Table of Contents
Does Microsoft Have a Blacklist?
Microsoft maintains its internal blacklists, which are used to reject emails coming from specific IP addresses. Microsoft also blacklists any IPs listed on the Spamhaus blacklist. As far as we know, this is the only external (DNS-based) blacklist that Microsoft uses. The rest of the blacklisted IPs are based on Microsoft’s criteria. These listings are not very transparent and include many false positives, as Microsoft will often list more extensive ranges.
There are Two Distinct Blacklists That Microsoft Uses
Each for different platforms. One is for OLC (Outlook Consumer), which is used by outlook.com, hotmail.com, live.com, and msn.com. The other is for Office365. If you receive an error message from Microsoft when sending emails, please check the error message to find out which blacklist the IP is on. Please make sure your server isn’t sending any spam and that your IP isn’t listed on any DNS-based blacklists. Please also ensure your emails comply with Microsoft's policies, practices, and guidelines, which can be found on their website: https://postmaster.live.com/pm/policies.aspx.
What Causes Microsoft to Blacklist My IP Address?
Before diving into the solution, here is a quick recap of the multiple reasons why Microsoft might be blacklisting your IP address. Microsoft’s servers will mark your communications as spam. Doing this persistently can get your IPs blacklisted. If your users find your email messages unhelpful, they may mark them as spam. This alerts Microsoft servers to treat your IP with caution.
Understanding Email Blacklisting and How to Avoid It
Persistence may earn you a blacklist entry. You may still get blacklisted after practicing good marketing hygiene if the settings of your DNS are misconfigured. If your emails are experiencing higher bounce rates, Microsoft may blacklist your IP. If your IP is forwarding an uncommonly high volume of emails to Outlook or Hotmail users, Microsoft can consider this as a red flag and blacklist you. Blacklisting is also a result of working with servers and IPs that have a bad reputation. Knowing these reasons makes it easier to understand why your email marketing isn’t performing as it should be. This is your first step in checking for the probable causes for blacklisting and IP blacklist removal.
Related Reading
• Blacklist Removal
• IP Address Reputation
• Blacklisted Email
How Do I Get Off Microsoft Blacklist?
Before you begin your IP blacklist removal process, you need to ascertain whether Microsoft has indeed banned your IP. It is a simple process. Suppose you know your mail servers are sending emails to Microsoft 365/Hotmail users. In that case, a blacklisted IP will be denied deliverability by Microsoft screening and return an error message to your inbox. The error message will look something like this: 550 5.7.511 Access denied, banned sender[xxx.xxx.xxx.xxx]. To request removal from this list, forward this message to delist@messaging.microsoft.com. For more information, go to https://go.microsoft.com/fwlink/?LinkId=526653.
This error message indicates that your mail IP has been banned from Microsoft users. You can now proceed to the delisting process.
Two Ways to Remove an IP from Microsoft’s Blacklist
If you did everything right and followed email marketing best practices, your IP can be easily delisted by following this guide. There are two ways you can remove an IP from Microsoft’s blacklist:
By contacting Microsoft through email
By using the Microsoft delisting service
Contact Microsoft Via Email
If your business was blacklisted for sending emails to Hotmail and/or other Live domains, you can use this simple method for IP blacklist removal. Send an email to “delist@messaging.microsoft.com” You can place your request to have your IPs delisted from the Microsoft server blacklists. You will receive a response within 48 hours of sending the email; however, if it takes longer, you can resend it. Note that this method only applies if you have been mailing to Hotmail/Live domains. For all other domains, you need to adopt the second method.
Use the Microsoft Delisting Service
Microsoft’s delisting service is available for email marketers who have been wrongfully blacklisted because of some reason. It is best to ensure that cyberattacks haven’t compromised your mail servers before you fill out the delisting form. Compromised servers do get delisted but end up back on the blacklist sometime later because of suspicious activity detection by Microsoft. Once you have ascertained that your mail servers are secure, follow the steps below to remove your IP from.
Visit the Microsoft delisting portal.
Please complete the captcha code and submit the form. Microsoft will send you a confirmation email at the address you provided earlier.
You now need to open this email address and find the email from Microsoft. Check the junk or spam folders if you don’t see it in your inbox.
Open this email, and click on the “Confirm your email address” link in the mail. You will be redirected to the delisting portal when you click the link.
This window will contain the IP address of your blocked mail server. To remove this IP from the blacklist, just select the IP and click on the “Delist IP Address” button.
It takes about 24 hours for Microsoft to work on your request and remove the IP from its blacklists.
Specific Instructions for Delisting Different Microsoft IP Blacklists
1. OLC (Outlook Consumer)
If an IP is listed on the OLC blacklist, then emails from that IP will be rejected with the following error message: 550 5.7.1 messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider.
Note: Microsoft uses two error codes. S3140 means the IP is entirely blocked, while S3150 is throttled.
How to Delist an IP from Microsoft's Blacklist
To delist IPs from this blacklist, please fill out the following form: https://olcsupport.office.com/. Once you have filled out the form, you should get a response within a few hours with the results of a first automated check on the IP. In rare cases, the result of this check will be that the IP has been “Mitigated,” which means it has been delisted from the blacklist. In most cases, the result will be that “Nothing was detected to prevent your mail from reaching Outlook.com customers” or even that the IP is “Not qualified for mitigation.” Please respond to the email and provide Microsoft's requested information in those cases. When you do so, the ticket will be escalated, and an actual staff member at Microsoft will take a look at the IP. They usually manually delist the IP (“We have implemented mitigation for your IP”). If they still refuse to delist the IP, and you’ve only recently been allocated the IP, you should tell them this. They will then require an email or PDF confirmation from us, the ISP, with information on when the IP was allocated.
2. Office365
For Office365, two separate but linked blacklists result in two separate error messages.
The first error message is:
550 5.7.606 Access denied, banned sending IP [x.x.x.x]. To request removal from this list please visit https://sender.office.com/ and follow the directions. For more information, please go to http://go.microsoft.com/fwlink/?LinkID=526655 (AS16012609)
To delist IPs from this blacklist, please fill out the form linked to in the error message: https://sender.office.com/. The error message also contains a link to the workflow to get the IP delisted. If you follow the instructions, the IP should be automatically delisted.
The second error message is:
550 5.7.511 Access denied, banned sender[x.x.x.x]. To request removal from this list please forward this message to delist@microsoft.com. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(1410)
Steps to Verify and Remove Your IP from Email Blocklists
When you contact the email address mentioned in this message, you should get a reply within a few days that the IP has been delisted: The IP address you submitted has been reviewed and removed from our block lists. Please note there may be a 1-2-hour delay before this change propagates through our system. The IP might have already been delisted, resulting in the following reply: The IP you submitted is not currently listed on any of our block lists. This may be due to an earlier delisting request already being processed. If you continue to receive Non-Delivery Receipts (NDRs) or “bounce messages” that indicate that our spam filtering system still blocks the IP address, please forward one of the messages to us, and we will investigate further. In this case, please follow the instructions and forward a recent error message to delist@microsoft.com. Using the delisting form will ask you to leave some (extra) personal information. This is how to fill in the form:
Microsoft form | Your answer |
Contact name | Your name |
What domain are you sending to | example@hotmail.com or another domain such as example@outlook.com |
Contact email address | Your own email address |
What domain are you sending from | The domain you were using when you sent the (blocked) email |
What would you describe your company or yourself | Select the relevant option (many times this is ‘others’) |
Outbound IP(s) or range(s) | The IP address of your VPS |
Is your server dedicated or shared? | Your VPS is dedicated, but if your VPS is used for multiple domains, specify shared |
Copy and paste any error messages | This means, the bounced header of your email |
Provide the url of your website | www.thisisanexample.com |
Microsoft Programs to Help Manage Email Deliverability
For advanced users, it can be helpful to join two free programs that Microsoft offers for OLC (not Office365): the Smart Network Data Services (SNDS) and the Junk Email Reporting program (JMRP). Neither the SNDS nor the JMRP allows you to delist your IP; they simply provide detailed information about the traffic on your sending IP, the sending IP's reputation with Microsoft, and the user complaint rates. As Microsoft says, there is no silver bullet to maintaining or improving a good IP reputation. Still, these programs help you proactively manage your email eco-system to help ensure better deliverability to Microsoft users.
SNDS
This program allows you to monitor the “health” and reputation of your registered IPs by providing data about traffic, such as mail volume and complaint rates originating from your IPs. This data is only offered to IPs that send more than 100 emails per day to Microsoft OLC accounts.
To register, please visit: https://sendersupport.olc.protection.outlook.com/snds/
You must request authorization for the IPs you would like access to. Microsoft uses a combination of WHOIS and rDNS to check who the owner of a particular IP is. In some cases, you can send an email to your domain to verify ownership.
JMRP
This is similar to a feedback loop (FBL) in that it will send you a copy of an email marked as “junk” by the recipient. However, to prevent listwashing, the JMRP will only send a copy of about one out of every 1,000 emails marked as junk. This limits the JMRP's usefulness, meaning many senders get little to no complaints via JMRP, even though recipients mark their emails as junk. You will first need to be authorized for the IP in the SNDS (see above) before creating a feed for it in the JMRP.
Related Reading
• How to Improve IP Reputation
• Google Blacklist Removal
• Blacklist Removal Tool
Start Buying Domains Now and Setup Your Email Infrastructure Today
Inframail helps agencies, recruiters, and sales development representatives scale cold email outreach with unlimited inboxes at a flat rate. With automated technical setup, dedicated IP addresses, and Microsoft-backed deliverability, Inframail is revolutionizing cold email infrastructure so users can focus on reaching prospects instead of wrestling with email configurations.
How Can Inframail Help Me Achieve Better Email Deliverability?
Inframail provides automated SPF, DKIM, and DMARC setup to help you achieve better email deliverability and sender reputation. The higher your email deliverability rates, the more prospects you reach.
Related Reading
• Remove Domain from Blacklist
• Check if Email Is on Blacklist
No one wants to be on a blacklist. The very name conjures up unsavory associations, and in the case of email, it can disrupt operations, damage the sender's reputation, and hurt business. If your email infrastructure is not up to par, it can happen overnight without warning. Understanding the Microsoft blacklist and how to get off, it can help reduce the stress of such an occurrence and ensure that you can quickly restore email operations. This article will cover how to get off the Microsoft blacklist, fix email reputation, avoid future blocks, and maintain an email infrastructure that will protect your deliverability and sender reputation.
Inframail’s email infrastructure solution can help you achieve these objectives. Our tools will help you quickly get off the Microsoft blacklist and ensure smoother email operations in the future.
Table of Contents
Does Microsoft Have a Blacklist?
Microsoft maintains its internal blacklists, which are used to reject emails coming from specific IP addresses. Microsoft also blacklists any IPs listed on the Spamhaus blacklist. As far as we know, this is the only external (DNS-based) blacklist that Microsoft uses. The rest of the blacklisted IPs are based on Microsoft’s criteria. These listings are not very transparent and include many false positives, as Microsoft will often list more extensive ranges.
There are Two Distinct Blacklists That Microsoft Uses
Each for different platforms. One is for OLC (Outlook Consumer), which is used by outlook.com, hotmail.com, live.com, and msn.com. The other is for Office365. If you receive an error message from Microsoft when sending emails, please check the error message to find out which blacklist the IP is on. Please make sure your server isn’t sending any spam and that your IP isn’t listed on any DNS-based blacklists. Please also ensure your emails comply with Microsoft's policies, practices, and guidelines, which can be found on their website: https://postmaster.live.com/pm/policies.aspx.
What Causes Microsoft to Blacklist My IP Address?
Before diving into the solution, here is a quick recap of the multiple reasons why Microsoft might be blacklisting your IP address. Microsoft’s servers will mark your communications as spam. Doing this persistently can get your IPs blacklisted. If your users find your email messages unhelpful, they may mark them as spam. This alerts Microsoft servers to treat your IP with caution.
Understanding Email Blacklisting and How to Avoid It
Persistence may earn you a blacklist entry. You may still get blacklisted after practicing good marketing hygiene if the settings of your DNS are misconfigured. If your emails are experiencing higher bounce rates, Microsoft may blacklist your IP. If your IP is forwarding an uncommonly high volume of emails to Outlook or Hotmail users, Microsoft can consider this as a red flag and blacklist you. Blacklisting is also a result of working with servers and IPs that have a bad reputation. Knowing these reasons makes it easier to understand why your email marketing isn’t performing as it should be. This is your first step in checking for the probable causes for blacklisting and IP blacklist removal.
Related Reading
• Blacklist Removal
• IP Address Reputation
• Blacklisted Email
How Do I Get Off Microsoft Blacklist?
Before you begin your IP blacklist removal process, you need to ascertain whether Microsoft has indeed banned your IP. It is a simple process. Suppose you know your mail servers are sending emails to Microsoft 365/Hotmail users. In that case, a blacklisted IP will be denied deliverability by Microsoft screening and return an error message to your inbox. The error message will look something like this: 550 5.7.511 Access denied, banned sender[xxx.xxx.xxx.xxx]. To request removal from this list, forward this message to delist@messaging.microsoft.com. For more information, go to https://go.microsoft.com/fwlink/?LinkId=526653.
This error message indicates that your mail IP has been banned from Microsoft users. You can now proceed to the delisting process.
Two Ways to Remove an IP from Microsoft’s Blacklist
If you did everything right and followed email marketing best practices, your IP can be easily delisted by following this guide. There are two ways you can remove an IP from Microsoft’s blacklist:
By contacting Microsoft through email
By using the Microsoft delisting service
Contact Microsoft Via Email
If your business was blacklisted for sending emails to Hotmail and/or other Live domains, you can use this simple method for IP blacklist removal. Send an email to “delist@messaging.microsoft.com” You can place your request to have your IPs delisted from the Microsoft server blacklists. You will receive a response within 48 hours of sending the email; however, if it takes longer, you can resend it. Note that this method only applies if you have been mailing to Hotmail/Live domains. For all other domains, you need to adopt the second method.
Use the Microsoft Delisting Service
Microsoft’s delisting service is available for email marketers who have been wrongfully blacklisted because of some reason. It is best to ensure that cyberattacks haven’t compromised your mail servers before you fill out the delisting form. Compromised servers do get delisted but end up back on the blacklist sometime later because of suspicious activity detection by Microsoft. Once you have ascertained that your mail servers are secure, follow the steps below to remove your IP from.
Visit the Microsoft delisting portal.
Please complete the captcha code and submit the form. Microsoft will send you a confirmation email at the address you provided earlier.
You now need to open this email address and find the email from Microsoft. Check the junk or spam folders if you don’t see it in your inbox.
Open this email, and click on the “Confirm your email address” link in the mail. You will be redirected to the delisting portal when you click the link.
This window will contain the IP address of your blocked mail server. To remove this IP from the blacklist, just select the IP and click on the “Delist IP Address” button.
It takes about 24 hours for Microsoft to work on your request and remove the IP from its blacklists.
Specific Instructions for Delisting Different Microsoft IP Blacklists
1. OLC (Outlook Consumer)
If an IP is listed on the OLC blacklist, then emails from that IP will be rejected with the following error message: 550 5.7.1 messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider.
Note: Microsoft uses two error codes. S3140 means the IP is entirely blocked, while S3150 is throttled.
How to Delist an IP from Microsoft's Blacklist
To delist IPs from this blacklist, please fill out the following form: https://olcsupport.office.com/. Once you have filled out the form, you should get a response within a few hours with the results of a first automated check on the IP. In rare cases, the result of this check will be that the IP has been “Mitigated,” which means it has been delisted from the blacklist. In most cases, the result will be that “Nothing was detected to prevent your mail from reaching Outlook.com customers” or even that the IP is “Not qualified for mitigation.” Please respond to the email and provide Microsoft's requested information in those cases. When you do so, the ticket will be escalated, and an actual staff member at Microsoft will take a look at the IP. They usually manually delist the IP (“We have implemented mitigation for your IP”). If they still refuse to delist the IP, and you’ve only recently been allocated the IP, you should tell them this. They will then require an email or PDF confirmation from us, the ISP, with information on when the IP was allocated.
2. Office365
For Office365, two separate but linked blacklists result in two separate error messages.
The first error message is:
550 5.7.606 Access denied, banned sending IP [x.x.x.x]. To request removal from this list please visit https://sender.office.com/ and follow the directions. For more information, please go to http://go.microsoft.com/fwlink/?LinkID=526655 (AS16012609)
To delist IPs from this blacklist, please fill out the form linked to in the error message: https://sender.office.com/. The error message also contains a link to the workflow to get the IP delisted. If you follow the instructions, the IP should be automatically delisted.
The second error message is:
550 5.7.511 Access denied, banned sender[x.x.x.x]. To request removal from this list please forward this message to delist@microsoft.com. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(1410)
Steps to Verify and Remove Your IP from Email Blocklists
When you contact the email address mentioned in this message, you should get a reply within a few days that the IP has been delisted: The IP address you submitted has been reviewed and removed from our block lists. Please note there may be a 1-2-hour delay before this change propagates through our system. The IP might have already been delisted, resulting in the following reply: The IP you submitted is not currently listed on any of our block lists. This may be due to an earlier delisting request already being processed. If you continue to receive Non-Delivery Receipts (NDRs) or “bounce messages” that indicate that our spam filtering system still blocks the IP address, please forward one of the messages to us, and we will investigate further. In this case, please follow the instructions and forward a recent error message to delist@microsoft.com. Using the delisting form will ask you to leave some (extra) personal information. This is how to fill in the form:
Microsoft form | Your answer |
Contact name | Your name |
What domain are you sending to | example@hotmail.com or another domain such as example@outlook.com |
Contact email address | Your own email address |
What domain are you sending from | The domain you were using when you sent the (blocked) email |
What would you describe your company or yourself | Select the relevant option (many times this is ‘others’) |
Outbound IP(s) or range(s) | The IP address of your VPS |
Is your server dedicated or shared? | Your VPS is dedicated, but if your VPS is used for multiple domains, specify shared |
Copy and paste any error messages | This means, the bounced header of your email |
Provide the url of your website | www.thisisanexample.com |
Microsoft Programs to Help Manage Email Deliverability
For advanced users, it can be helpful to join two free programs that Microsoft offers for OLC (not Office365): the Smart Network Data Services (SNDS) and the Junk Email Reporting program (JMRP). Neither the SNDS nor the JMRP allows you to delist your IP; they simply provide detailed information about the traffic on your sending IP, the sending IP's reputation with Microsoft, and the user complaint rates. As Microsoft says, there is no silver bullet to maintaining or improving a good IP reputation. Still, these programs help you proactively manage your email eco-system to help ensure better deliverability to Microsoft users.
SNDS
This program allows you to monitor the “health” and reputation of your registered IPs by providing data about traffic, such as mail volume and complaint rates originating from your IPs. This data is only offered to IPs that send more than 100 emails per day to Microsoft OLC accounts.
To register, please visit: https://sendersupport.olc.protection.outlook.com/snds/
You must request authorization for the IPs you would like access to. Microsoft uses a combination of WHOIS and rDNS to check who the owner of a particular IP is. In some cases, you can send an email to your domain to verify ownership.
JMRP
This is similar to a feedback loop (FBL) in that it will send you a copy of an email marked as “junk” by the recipient. However, to prevent listwashing, the JMRP will only send a copy of about one out of every 1,000 emails marked as junk. This limits the JMRP's usefulness, meaning many senders get little to no complaints via JMRP, even though recipients mark their emails as junk. You will first need to be authorized for the IP in the SNDS (see above) before creating a feed for it in the JMRP.
Related Reading
• How to Improve IP Reputation
• Google Blacklist Removal
• Blacklist Removal Tool
Start Buying Domains Now and Setup Your Email Infrastructure Today
Inframail helps agencies, recruiters, and sales development representatives scale cold email outreach with unlimited inboxes at a flat rate. With automated technical setup, dedicated IP addresses, and Microsoft-backed deliverability, Inframail is revolutionizing cold email infrastructure so users can focus on reaching prospects instead of wrestling with email configurations.
How Can Inframail Help Me Achieve Better Email Deliverability?
Inframail provides automated SPF, DKIM, and DMARC setup to help you achieve better email deliverability and sender reputation. The higher your email deliverability rates, the more prospects you reach.
Related Reading
• Remove Domain from Blacklist
• Check if Email Is on Blacklist
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