Comparison
Jan 24, 2026
CEO and co-founder
Maildoso Shared IP vs Dedicated IP: Which Delivers Better Inbox Rates?
Understanding Maildoso's IP strategy: How it actually works
Maildoso built their infrastructure around a shared IP pool model. Multiple users send emails from the same IP addresses simultaneously. According to Woodpecker's analysis, Maildoso operates hundreds of email accounts and domains using this shared pool, offering a cost-effective solution for businesses managing high-volume campaigns.
The platform uses IP rotation to distribute sends across several different IP addresses within their pool. The theory is that spreading volume across multiple IPs makes campaigns less visible to spam filters. If one IP shows signs of being flagged, the system automatically reroutes traffic to alternative domains and IPs.
The critical limitation: Maildoso does not offer dedicated IPs. Industry analysis confirms that Maildoso relies exclusively on shared IP infrastructure, meaning users share reputation with all other senders on the platform. For contrast, Inframail's dedicated IP infrastructure assigns individual IPs to isolate reputation completely.
What Maildoso's IP rotation includes:
Automatic switching: IP changes when one address shows deliverability issues
Volume distribution: Sends spread across multiple shared IPs
Recovery cycle: 14-day pause for burned mailboxes
Link protection: Domain redirection to minimize tracking exposure
What you don't get:
Dedicated IP assignment for your account
Reputation isolation from other senders
Control over who shares your infrastructure
Your deliverability becomes a function of how well (or poorly) every other sender on your IP behaves. You can follow every best practice, warm up properly, and write perfect copy. None of that protects you from a neighbor who blasts 50,000 emails to a purchased list.
The hidden risks of shared IP pools for agencies
The "bad neighbor" effect
Think of shared IPs like carpool lanes where other drivers affect your commute. ChemiCloud's technical documentation explains that if one sender on your shared IP engages in spammy activities, it affects the IP reputation for everyone on that server, impacting email deliverability regardless of your individual practices.
Email deliverability experts confirm this risk directly: if another sender on your shared IP starts sending spam or experiences high complaint rates, it negatively affects your deliverability even if your practices are impeccable.
For agencies, this creates a specific problem. You can build perfect campaigns, manage client expectations, and follow every warmup protocol. But your results depend on strangers you will never meet and cannot control.
Blacklist cascades and client churn risk
When shared IPs land on blacklists like UCEPROTECT or Spamhaus, every sender on that IP gets flagged simultaneously. Saleshandy's infrastructure analysis documents user reports of domains getting blacklisted shortly after setup on shared infrastructure.
One user complaint captured by Woodpecker describes this scenario:
"I've been sending cold emails for years and never burned a domain. Then with Maildoso every single domain was burned in a single day because of a 'large scale issue' they were facing."
The same user noted replacement domains were .click and .xyz extensions rather than .com domains originally purchased, further impacting deliverability during recovery.
The business impact is immediate. Validity research shows 1 in 6 legitimate business emails never reach the inbox, often due to domain blacklisting. For agencies, this creates direct churn risk when inbox rates drop from 80% to 55% overnight with no change to your sending practices.
Recovery timelines make this worse. Industry data shows companies typically need three to five business days minimum for blacklist removal, with full reputation recovery taking weeks or months. During this window, client campaigns pause and results suffer.
Maildoso shared IP vs. dedicated IP: A direct comparison
Since Maildoso operates exclusively on shared infrastructure, this comparison shows shared pools (like Maildoso) against dedicated IP options (like Inframail).
Factor | Shared IP (Maildoso) | Dedicated IP (Inframail) |
Reputation control | None. Shared with all users | Complete. Your behavior only |
Blacklist risk | High. One bad sender affects all | Low. Isolated to your activity |
Setup time | Manual DNS required | Automated (under 5 min) |
Starting price | $100/mo for 32 mailboxes | $129/mo flat (unlimited) |
Warmup included | Extra cost per mailbox | Requires external tool |
IP rotation | Automatic within shared pool | Fixed dedicated IP(s) |
Best use case | Testing, burner domains | Client campaigns, long-term |
Key trade-offs for agencies managing 50+ domains:
Control vs. cost: Shared pools cost less per mailbox initially but offer zero reputation control
Predictability: Dedicated IPs deliver consistent results because you are the only variable
Troubleshooting: When deliverability drops on dedicated IPs, you know the problem is something you can fix
The Inframail YouTube channel published a detailed breakdown of these differences, showing how dedicated IPs eliminate the "neighbor noise" that plagues shared infrastructure.
Cost analysis: When does the dedicated upgrade break your margin?
Running the math reveals when shared IP savings become false economy.
50 inboxes on Maildoso shared:
Based on Woodpecker's pricing analysis, Maildoso charges $100/month for 32 mailboxes. Scaling to 50 mailboxes requires the next tier. Platform cost plus additional warmup fees add to the total monthly spend.
50 inboxes on Inframail dedicated:
Platform cost is $129/month flat for unlimited inboxes with 1 dedicated US-based IP included. External warmup tools (like Warmbox or Lemwarm) add approximately $15-50/month for pooled services.
The cost comparison at scale:
Scale | Maildoso (platform only) | Inframail (dedicated) |
32 mailboxes | $100/mo | $129/mo |
100+ mailboxes | Higher tiers required | $129/mo flat |
400 mailboxes | $733/mo | $129/mo flat |
TThe Agency Pack at $327/month](https://inframail.io/) includes 3 dedicated IPs for agencies managing higher client volumes across multiple campaigns.
The hidden cost of domain replacement:
When shared IP issues burn your domains, replacement costs compound. Beyond the $10-15 per domain, Scrupp's domain research explains that damaged domain reputation leads to reduced marketing ROI, customer service disruptions, brand reputation erosion, and increased operational costs diverted to troubleshooting.
The shared IP "savings" disappear when you factor in domain replacement cycles and campaign pauses during recovery periods.
Why dedicated IPs are non-negotiable for cold email scaling
1. Reputation isolation protects client relationships
Email deliverability experts explain the core advantage: when reputation matters, it can be risky to put your reputation in the hands of neighboring senders. Your neighborhood's reputation is only as good as your worst neighbor.
For agencies billing $2,000-5,000 per client monthly, reputation isolation is not a nice-to-have feature. It is the foundation of predictable results.
2. Troubleshooting becomes possible
When deliverability drops on a dedicated IP, you know the problem exists somewhere in your control: your copy, your list quality, your sending volume, or your warmup. You can diagnose and fix issues systematically.
On shared pools, deliverability drops could be your fault, your neighbor's fault, or a platform-wide issue. You cannot troubleshoot what you cannot isolate.
3. Volume thresholds demand dedicated infrastructure
Industry research from Litmus recommends that teams sending more than 100,000 emails per month should use dedicated IPs. This volume threshold exists because at scale, the statistical likelihood of sharing an IP with a bad sender approaches certainty.
Agencies managing 50+ domains across multiple clients typically exceed this threshold quickly.
Inframail vs. Maildoso: The flat-rate dedicated alternative
Inframail built their infrastructure specifically to solve the cost vs. quality dilemma that forces agencies into shared IP compromises.
What the flat rate includes
The Inframail Unlimited plan provides dedicated infrastructure with automated management:
1 dedicated US-based IP (your reputation only)
Unlimited email inbox creation
Automated SPF, DKIM, DMARC configuration
Domain health monitoring with blacklist alerts
Priority support (16 hours daily)
CSV export for Instantly/Smartlead import
Based on user documentation, setup takes under 5 minutes per domain batch with automated DNS configuration.
"I personally have over 1,000 email accounts with Inframail for one flat price. Adding all those records would have probably taken dozens of hours. Instead all records were added within 10 minutes." - Verified user review of Inframail
Setup speed comparison
The Inframail setup tutorial demonstrates the complete workflow from domain purchase to inbox provisioning. Users consistently report fast setup times:
"I can set-up inboxes in 5mins while saving money on Google Workspace subscriptions and benefit from great deliverability." - Verified user review of Inframail
The automated DNS configuration eliminates manual SPF/DKIM/DMARC setup. Our Cold Email Setup tutorial walks through the automation for 10+ inboxes in under 3 minutes. For agencies managing multiple client onboardings, this reduces setup time from hours to minutes per domain batch.
For a comprehensive infrastructure walkthrough, watch the Ultimate Cold Email Infrastructure Guide.
Final verdict: Which setup protects your client retention?
Based on the data, we recommend:
Use shared IPs (like Maildoso) only for:
Testing new copy or sequences before scaling
Burner domains where reputation does not matter
Very low volume sending under 10,000 emails/month
Budget-constrained situations where deliverability risk is acceptable
Use dedicated IPs for:
All client campaign sending
Any domain you want to protect long-term
Volume exceeding 100,000 emails/month
Situations where predictable deliverability affects revenue
For agencies managing client relationships, the shared IP model creates too much uncontrollable risk. One bad neighbor can burn campaigns you spent weeks building.
"Inframail has been absolute gold in terms of delivering a great customer experience, and allowing me to spin up cold email infrastructure at scale for my clients as easily and fast as possible." - Verified user review of Inframail
"One of the best mailbox infra vendors I have ever used super easy and quick setup and support is practically 24/7 with at max a 2min wait to get a question answered." - Verified user review of Inframail
Sign up to Inframail and get started today. Inframail is trusted by agencies worldwide, with 38 5-star reviews on Trustpilot here.
Frequently asked questions
Does Maildoso include warmup?
Maildoso does not include premium warmup in base pricing. According to Saleshandy's analysis, warmup costs extra, with advanced AI warmup ranging from $160-2,000/month depending on volume.
How many emails can I send on a shared IP?
Volume limits depend on the provider and plan tier. The bigger constraint is reputation degradation from other senders, which can limit effective deliverability regardless of your technical sending limit.
What is the difference between a shared and dedicated IP?
Shared IPs pool multiple senders on one address (your reputation depends on everyone). Dedicated IPs assign one address to you alone (your behavior determines your reputation).
Can I switch from shared to dedicated on Maildoso?
Maildoso does not offer dedicated IPs. To get dedicated IP infrastructure, you need to migrate to a provider like Inframail that includes dedicated IPs in their plans.
How long does it take to recover from a shared IP blacklist?
Industry data shows 3-5 business days minimum for delisting, with full reputation recovery potentially taking weeks or months depending on severity.
How do I warm up inboxes after switching infrastructure?
Our warmup guide covers the migration process, and this domain warmup article explains best practices for new cold email campaigns.
Key terms glossary
Shared IP pool: An IP address used by multiple senders simultaneously. Your sender reputation is influenced by every other user on that IP, making deliverability partially outside your control.
Dedicated IP: An IP address assigned exclusively to your account. Your sending behavior alone determines your reputation score with mailbox providers.
Bad neighbor effect: The phenomenon where one sender's poor practices (spam, high bounces) negatively impact deliverability for all other senders sharing the same IP address.
IP rotation: Automatically switching between multiple IP addresses during email campaigns to distribute send volume and reduce the visibility of high-volume sending patterns.
Sender reputation: A score assigned by mailbox providers (Gmail, Outlook) based on sending history, complaint rates, bounce rates, and engagement metrics. Higher scores mean better inbox placement.
