Cold Emailing
Jan 22, 2026
CEO and co-founder
How to Switch from Maildoso to Inframail: Step-by-Step Migration Guide
The technical case for migration: Shared vs dedicated IP infrastructure
The core difference between Maildoso and Inframail comes down to IP architecture. Maildoso rotates your sending across shared IP pools. Inframail gives you dedicated US-based IPs that only your accounts use.
Think of shared IPs like an apartment building. When one tenant gets flagged for noise complaints, the whole building's reputation suffers. Your sender reputation on a shared IP is susceptible to other users' sending behavior. One spammer on your pool can tank your client campaigns overnight, and you have zero visibility into what happened.
Dedicated IPs work like owning a private house. If you manage your own IP address and follow best practices for sending email, you build credibility as a trustworthy sender. Your behavior alone determines your ESP trust level.
Factor | Shared IP (Maildoso) | Dedicated IP (Inframail) |
|---|---|---|
IP control | Multiple users share same IPs | Single user per IP |
Neighbor risk | Other senders can damage your reputation | Only your sending affects reputation |
Predictability | Inconsistent deliverability | Controllable performance |
Pricing model | Per-inbox charges | $129/month flat rate unlimited |
For a detailed breakdown of the technical differences, watch the Dedicated IP vs Shared IP Pools for Cold Email comparison video on our channel.
Phase 1: Preparation and data export
Before touching anything in Inframail, you need to secure your existing data. This phase takes 15-20 minutes and prevents any data loss during the switch.
Audit your current domain health
Start by testing your existing domains on Mail-Tester. Send a test email from each active domain and check the score. If any domains score below 7/10, they're likely burned and not worth migrating. Purchase fresh domains through Inframail instead.
Document which domains are healthy (8+/10 score) and which need replacement. This audit saves you from migrating problem domains that will hurt performance from day one.
Export active lead lists and suppression files
Your sending tools (Instantly or Smartlead) hold the data that matters most. Before the switch, export everything:
Active campaign contacts: Download all leads as CSV files with custom fields intact. Each contact needs an email address as the mandatory field.
Suppression lists: Export unsubscribed contacts, bounced addresses, and spam complaints. This prevents re-sending to problematic addresses.
Campaign sequences: Screenshot or document your email templates, sending schedules, and A/B test configurations.
Performance benchmarks: Note your current open rates, reply rates, and inbox placement. You'll compare these post-migration.
The good news: your sending platform stores all conversation history. You're only migrating the infrastructure layer, not your campaign data. Learn more about calculating your email sending capacity to plan your new setup.
Phase 2: The migration protocol (60-minute workflow)
This is the core of the migration. With Inframail's automated DNS configuration, what used to take 12+ hours of manual panel work now happens in minutes.
Step 1: Domain configuration and DNS automation
Log into your Inframail dashboard and navigate to the domain setup section. You can either purchase new domains directly through the platform ($6-16 per year) or transfer existing domains.
Here's what happens when you add a domain:
Enter your domain name(s)
Click the auto-configure button
Inframail automatically creates your SPF, DKIM, and DMARC records
The dashboard shows real-time configuration status
"InfraMail makes it remarkably easy to purchase domains, configure them correctly, create inboxes, and initiate warm-up immediately. The level of automation is exceptional and clearly designed for serious operators." Inframail has 38 5-star reviews on Trustpilot. - Verified user review of Inframail
The Unlimited Plan allows unlimited domain setups. If you're migrating 50+ domains, plan accordingly or consider the Agency Pack ($327/month). (You can add domains as needed during migration). For a visual walkthrough, watch the InfraMail Setup Tutorial for Cold Email.
DNS propagation timing: Records typically propagate within 24-48 hours, though some DNS providers complete faster. The dashboard displays propagation status so you know exactly when domains are ready.
Step 2: Provisioning inboxes on dedicated IPs
Once domains show "Configured" status, create your inboxes. Navigate to the inbox creation section and you have two options:
Bulk creation: Upload a CSV with desired email addresses (e.g., firstname@domain.com patterns)
Pattern generation: Let the system auto-generate addresses based on your naming convention
"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
The system provisions each inbox on your dedicated IP(s) and generates IMAP/SMTP credentials automatically. Your Unlimited Plan includes 1 dedicated US-based IP. The Agency Pack ($327/month) includes 3 dedicated IPs for higher-volume operations.
For the complete setup process, the How to send 1000+ Cold Emails Per Day video demonstrates buying 5 domains and setting up 10 inboxes in under 4 minutes.
Step 3: Reconnecting to Instantly or Smartlead
After creating inboxes, export credentials as a CSV file. Go to the Update tab in Inframail to download CSV files with your credentials.
For Instantly:
Go to Email Accounts in the left sidebar
Click Add New
Select Connect existing accounts > Any Provider > Bulk Import from CSV
Upload your Inframail CSV
Map columns: email, password, SMTP host, SMTP port, IMAP host, IMAP port
Click Import
You need both IMAP and SMTP protocols configured for reply detection and warmup to work properly in Instantly.
For Smartlead:
Open email accounts section
Click Add Account(s)
Select Bulk Add and drag your CSV into the upload field
Smartlead automatically maps standard fields like name and email
Review mapping and click Import
Because Inframail uses standard IMAP/SMTP protocols, credentials work with any email platform that supports custom connections. The Inframail Walkthrough video shows the complete flow from sign-up through Instantly bulk import.
Phase 3: Post-migration verification
You've configured domains, created inboxes, and connected to your sending tool. Now verify everything works before scaling up.
Testing deliverability with Mail-Tester
Send a test email from each newly connected inbox to a Mail-Tester address. Target score: 9/10 or higher.
The test checks:
SPF alignment: Confirms authorized sending servers
DKIM signature: Validates email authenticity via cryptographic authentication
DMARC policy: Verifies proper handling of failed authentication
IP reputation: Confirms your dedicated IP has no existing blacklist flags
If any inbox scores below 9/10, check that DNS has fully propagated (wait the full 24-48 hours) and verify no typos exist in configuration. Inframail's health dashboard also monitors for blacklist additions and auto-submits delisting requests at a 68.3% success rate.
The 14-day ramp-up schedule
Even with dedicated IPs, new infrastructure needs reputation building. Follow this warmup progression to establish trust with inbox providers:
Days | Emails per inbox | Focus |
|---|---|---|
1-3 | 10-20/day | Send to most engaged contacts only |
4-7 | 20-40/day | Gradual increase, monitor metrics |
8-10 | 40-60/day | Continue scaling if deliverability holds |
11-14 | 60-80/day | Approach full operational volume |
15+ | 80-100/day | Normal cold email sending rate |
During the ramp-up, sending good content is critical for building stable reputation. Avoid spam trigger words and maintain proper list hygiene. Track bounce rates (target under 2%) and spam complaints (target under 0.1%).
Inframail's help center provides detailed guidance on how to warm up inboxes after migrating. If you haven't sent from an IP in more than 30 days, you'll need to repeat the warmup schedule.
"I can set-up inboxes in 5mins while saving money on Google Workspace subscriptions and benefit from great deliverability. All of my campaigns on Inframail are on a >10% reply rate, which is really good." - Verified user review of Inframail
Cost analysis: Maildoso vs Inframail TCO
The economics of this migration favor flat-rate pricing at scale. Here's the math for typical agency configurations:
Scale | Maildoso (shared IP) | Inframail Unlimited (dedicated IP) | Annual savings |
|---|---|---|---|
50 inboxes | ~$115/month | $129/month + ~$34 domains | Break-even with better infrastructure |
100 inboxes | ~$229/month | $129/month + ~$68 domains | $384/year |
200 inboxes | ~$458/month | $129/month + ~$136 domains | $2,316/year |
The flat-rate model becomes increasingly advantageous as you scale. At 200 inboxes, you're saving nearly $200/month while getting dedicated IPs instead of shared pools.
But cost isn't the only factor. The hidden expense of shared IP infrastructure is unpredictable deliverability. When inbox rates drop from 80% to 55% because of a "bad neighbor," you lose meetings, damage client relationships, and spend weekends firefighting. Dedicated IPs give you complete control over sender reputation.
"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
For more context on results agencies achieve after switching, watch the 200+ Appointments PER MONTH interview with Bhavesh Kumar or the Book 30+ Calls case study with Daphné Barret.
Migration checklist
Use this checklist to track your progress:
Pre-migration (Day 1)
Audit current domains on Mail-Tester
Export lead lists from Instantly/Smartlead
Export suppression files (bounces, unsubscribes, complaints)
Document campaign sequences and settings
Note current performance benchmarks
Migration (Day 1-2)
Sign up for Inframail Unlimited Plan ($129/month)
Add domains and initiate DNS auto-configuration
Wait for propagation (monitor dashboard status)
Bulk-create inboxes on dedicated IPs
Export credentials CSV
Integration (Day 2-3)
Import CSV to Instantly or Smartlead
Verify IMAP/SMTP connection for all accounts
Run Mail-Tester on 3-5 sample inboxes
Confirm 9+/10 authentication scores
Validation (Days 3-17)
Begin 14-day warmup schedule
Monitor bounce rates (<2%) and complaints (<0.1%)
Keep Maildoso active during overlap period
Cancel Maildoso after successful validation
For the complete infrastructure guide, the Ultimate Cold Email Infrastructure Guide for 2025 covers everything from domain selection to campaign optimization.
Ready to move from shared IP uncertainty to dedicated infrastructure you control? Sign up to Inframail and get started today. The Unlimited Plan gives you dedicated US-based IPs, unlimited inboxes, and automated DNS setup for $129/month flat.
"Been using Inframail for 2+ years now... Pretty solid deliverability compared to other platforms I've used in the past." - Verified user review of Inframail
Frequently asked questions about migration
Can I keep my existing domains when switching to Inframail?
Yes. Transfer domains you own into Inframail and the platform auto-configures DNS records. Only migrate domains scoring 8+/10 on Mail-Tester. Burned domains should be replaced.
Will I lose emails during the migration?
No, if you maintain a 24-48 hour overlap period running both systems. Your conversation history lives in Instantly/Smartlead, not the email infrastructure layer.
How long is the actual downtime during migration?
Zero downtime if you follow this protocol. Keep Maildoso active until Inframail inboxes are verified and connected. Switch campaigns over once testing confirms 9+/10 Mail-Tester scores.
Does Inframail work with Instantly and Smartlead?
Yes. Inframail generates standard IMAP/SMTP credentials that bulk-import into both platforms. The CSV export format is designed for compatibility. Check what email platforms work with Inframail for the full list.
Do I need to warm up inboxes on dedicated IPs?
Yes. New IPs require a 14-day ramp-up to build reputation with inbox providers. Start at 10-20 emails/day per inbox and scale gradually to 80-100/day.
Key migration terminology
Dedicated IP: An IP address used exclusively by your accounts. Only your sending behavior affects reputation, giving you complete control over deliverability.
Shared IP pool: IP addresses used by multiple senders simultaneously. Other users' poor practices can damage your reputation without your knowledge.
DNS propagation: The time required for DNS record changes to spread across global servers. Typically 24-48 hours for SPF, DKIM, and DMARC updates.
SMTP: Simple Mail Transfer Protocol. The protocol your sending tools use to deliver outgoing emails through Inframail's servers. Standard port: 587.
IMAP: Internet Message Access Protocol. Enables reply detection, warmup activities, and inbox management. Required alongside SMTP for full functionality in cold email tools.
