Comparison
Jan 22, 2026
CEO and co-founder
Mailforge vs Maildoso vs Inframail: Which cold email infrastructure wins for agencies?
The core trade-off: Shared IP pools vs dedicated infrastructure
Before comparing features, you need to understand the fundamental architectural difference that affects every campaign you'll ever run.
How shared IP pools work (and fail)
Maildoso and Mailforge both operate on shared IP infrastructure. Your emails go out from the same IP addresses used by hundreds or thousands of other cold emailers. According to GMass's infrastructure analysis, Maildoso operates hundreds of email accounts and domains using a shared IP pool with dynamic IP rotation.
Think of it like a public swimming pool. Easy to get in, affordable, but if someone contaminates the water, everyone suffers. One aggressive sender on your shared IP can trigger spam filters that affect your entire campaign.
User complaints validate this risk. One Maildoso user reported on G2 that every domain they used was "burned in a single day" due to a "large scale issue." They had sent cold emails for years without burning a domain before switching to shared infrastructure.
How dedicated IPs isolate your reputation
Inframail takes the opposite approach. Each plan includes dedicated US-based IP addresses (1 IP for the Unlimited Plan, 3 IPs for the Agency Pack). Your sending behavior alone determines your ESP trust level.
The dedicated IP vs shared IP comparison video from Inframail's channel explains the technical differences in detail, but here's the bottom line: dedicated IPs give you control. Shared IPs give you risk.
Feature breakdown: Deliverability, automation, and constraints
Let me walk through each platform's actual capabilities and limitations.
Maildoso: Flexible entry with shared IP risks
Maildoso markets itself to beginners and freelancers testing cold email on a budget. The platform supports both SMTP inboxes and official Google Workspace accounts, giving you flexibility on inbox type.
What works:
Low barrier to entry for small volume (12 accounts for ~$33/month on quarterly plans)
Supports Google and Microsoft mailboxes
Setup takes 10-15 minutes for 10+ mailboxes according to G2 users
What doesn't:
Quarterly billing only. No monthly option means committing $99-$2,199 upfront before you validate deliverability
Shared IP pools mean your reputation depends on strangers' sending practices
AI warmup costs an additional $160-$2,000/month and only works with Gmail/Outlook
Users report deliverability problems despite implementing "all preventative measures"
For a solo freelancer running 10-15 inboxes who doesn't mind quarterly commitments, Maildoso can work. For agencies managing client campaigns where deliverability failure means churn, the shared IP risk creates unacceptable exposure.
Mailforge: Volume sending on shared networks
Mailforge positions itself as the "automated setup" solution with per-slot pricing. Their pricing page shows $3/month per mailbox slot with a minimum purchase of 10 slots.
What works:
Automatic SPF, DKIM, and DMARC configuration following industry best practices
Procedures that typically take hours now complete in minutes
Lower per-inbox cost than Maildoso at small scale
What doesn't:
Runs only on shared IPs. No dedicated IP option in the standard product
Slot-based billing means you pay for capacity whether you use it or not
Dedicated mailboxes require their separate "Infraforge" premium product
Domains cost $70/year for .com through their platform
The Mailforge model works for teams wanting affordable automation without dedicated infrastructure. But the shared IP limitation becomes a ceiling as you scale. When one campaign on the network triggers spam complaints, your carefully warmed domains take the hit.
Inframail: Dedicated IPs and flat-rate scaling
Inframail built its platform on a different premise: agencies need predictable costs and reputation isolation at scale. The Unlimited Plan at $129/month includes unlimited email inboxes, 1 dedicated US IP, and automated DNS configuration. The Agency Pack ($327/month) includes 3 dedicated IPs for higher-volume operations.
What works:
Flat-rate pricing whether you create 50 or 500 inboxes
Dedicated IPs isolate your sending reputation from other users
DNS auto-configuration handles SPF, DKIM, and DMARC in seconds
Built on Microsoft's cloud platform
One-on-one deliverability consulting included
"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." Inframail has 38 5-star reviews on Trustpilot. - Verified user review of Inframail
What to consider:
Microsoft-only infrastructure (no Google Workspace option)
Requires external warmup tools like Warmbox or TrulyInbox at $15-29/month
Domains cost $16.44 through the platform or $5 to migrate existing domains
US-based infrastructure only (no EU/APAC data residency)
For agencies running 50+ domains where margin protection and deliverability consistency matter, Inframail's model solves the core scaling problem. You're not gambling your client campaigns on shared IP pool health.
The Ultimate Cold Email Infrastructure Guide walks through the complete setup process if you want to see the workflow before committing.
Cost analysis: Calculating true cost per inbox at scale
Let me show you the actual math that agency owners need to see before picking a platform.
The 50-inbox agency scenario
Most growing agencies hit this inflection point first. You're managing 5-8 clients, each needing 6-10 inboxes for proper domain rotation. Here's what 50 inboxes actually costs on each platform:
Cost Component | Inframail | Maildoso | Mailforge | Google Workspace |
Platform fee | $129/mo | $166/mo (68 mailboxes) | $150/mo (50 slots) | $350-420/mo |
Domain costs | ~$40/mo amortized | Included | ~$58/mo (10 domains) | Separate |
Warmup tools | $0-29/mo (external) | $160+/mo (optional) | Varies | N/A |
IP type | Dedicated (1) | Shared pool | Shared pool | N/A |
Monthly total | $169-198 | $166-326 | $208+ | $350-420 |
The Inframail math works out to roughly $3.40-3.96 per inbox at 50 scale. Maildoso's base pricing looks similar, but add their AI warmup ($160/mo minimum) and you're at $326/month or $6.52 per inbox.
More importantly, Inframail includes dedicated IPs. The others don't.
The 200-inbox scaling scenario
This is where flat-rate economics crush per-inbox pricing. You're running a proper agency with 15-25 clients, each campaign needs domain rotation coverage:
Cost Component | Inframail | Maildoso | Mailforge |
Platform fee | $129/mo | $733/mo (400 plan) | $600/mo (200 slots) |
Domain costs | ~$167/mo amortized | Included | ~$233/mo |
Warmup (external) | $0-29/mo | $160+/mo | Varies |
Monthly total | $296-325 | $893+ | $833+ |
Annual savings vs Maildoso | $6,816+ | Baseline | $720 |
At 200 inboxes, Inframail saves over $550/month versus Maildoso. That's $6,600+ annually you can put toward hiring, marketing, or actually paying yourself.
"Compared to other ESP providers, using Inframail kinda feels like magic. As soon as you start the process of creating email accounts, it will automatically start adding all the records for you." - Verified user review of Inframail
The video showing 1000+ cold emails per day setup demonstrates how agencies actually implement this at scale.
Why warmup costs matter in your TCO
None of these platforms include robust warmup by default. Maildoso offers AI warmup as an add-on starting at $160/month. Mailforge has partial warmup features. Inframail requires external tools.
Third-party warmup services like Warmup Inbox cost $15/month per inbox, while TrulyInbox offers $29/month for unlimited mailboxes. For agencies at scale, a flat-rate warmup tool combined with Inframail's flat-rate infrastructure creates fully predictable costs.
Inframail's help documentation on warmup walks through the recommended process for new accounts.
Operational reality: Setup speed and management
Time spent configuring DNS records is time not spent on sales calls or client strategy. Here's what each platform actually requires.
Maildoso setup process
Maildoso users report 10-15 minutes to get domains and mailboxes configured. The platform handles basic setup, but you're still managing credentials across multiple dashboards if you're running warmup and sending through separate tools.
The quarterly billing structure also means you're locked in before validating performance. If deliverability tanks in month two, you've already paid for month three.
Mailforge setup process
Mailforge automates DKIM, SPF, and DMARC configuration following best practices. What used to take hours completes in minutes. The slot-based system makes scaling straightforward, just buy more slots.
However, the shared IP architecture means your setup quality doesn't fully control your outcomes. You can do everything right and still get hit by network-wide reputation damage.
Inframail setup process
This is where Inframail's automation shines. The platform handles full DNS configuration automatically through their SPF, DKIM, DMARC automation.
The Inframail 3.5 demo video shows the complete workflow: domains to inboxes in under 180 seconds. Purchase domains through the platform, watch DNS records auto-configure, create unlimited inboxes, export CSV to your sending tool.
For agencies managing multiple client campaigns, this workflow difference compounds. Manual DNS configuration for 50 domains takes 12+ hours. Inframail's automation handles it in minutes.
"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." - Verified user review of Inframail
The step-by-step InfraMail setup tutorial provides a detailed walkthrough if you want to see the exact process before signing up.
Integration with sending platforms
Your infrastructure only matters if it connects cleanly to your sending tools. All three platforms work with major cold email sequencers like Instantly and Smartlead.
Inframail generates IMAP/SMTP credentials that export directly to CSV. Import to Instantly or Smartlead, and you're operational. The full cold email setup video with Instantly shows this integration in practice.
Maildoso and Mailforge follow similar credential export patterns. The differentiator isn't integration capability. It's what happens to your campaigns when the underlying infrastructure has deliverability problems.
Real agency results
Numbers on paper matter less than actual campaign performance. Here's what agencies report using Inframail:
"All of my campaigns on Inframail are on a >10% reply rate, which is really good." - Verified user review of Inframail
The user interview with Jackson Williams breaks down his approach to booking 6 calls per day (120+ monthly) using Inframail infrastructure. Another agency owner, Bhavesh Kumar, shares how he books 200+ appointments per month with proper infrastructure setup.
One particularly notable case: the video documenting a $50,000 client acquisition through cold email explains the infrastructure requirements for high-ticket outreach.
"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
Final verdict: Which platform fits your stage?
The right choice depends on where you are in your agency growth:
Freelancer or solo operator (under 20 inboxes):
Maildoso or Mailforge might save you money if you're comfortable with shared IP risk and quarterly commitments. The math favors per-inbox pricing at small scale.
Growing agency (20-50 inboxes):
This is the transition zone. Per-inbox costs start compounding, but you haven't hit the full pain yet. If client retention matters (and it should), the dedicated IP protection from Inframail becomes worth the slight premium.
Scaling agency (50+ inboxes):
Inframail wins on both economics and risk management. Flat-rate pricing protects your margins as you add clients. Dedicated IPs protect your campaigns from shared pool contamination.
"I've been using Inframail for a few months now an they are not only reasonably priced for the service but always go out of their way to assist where needed." - Verified user review of Inframail
The cold email system setup video shows how quickly you can get operational, and the 10,000+ cold emails case study demonstrates spam folder avoidance at volume.
Sign up for Inframail and get started today. The Unlimited Plan at $129/month includes everything you need: dedicated IP, unlimited inboxes, automated DNS, and priority support.
Frequently asked questions
How many inboxes can I create on Inframail's Unlimited Plan?
Unlimited. The $129/month flat rate includes no per-inbox fees or caps.
Does Maildoso offer monthly billing?
No. Maildoso requires quarterly billing commitments starting at $99 for three months.
What's the difference between shared and dedicated IPs?
Shared IPs pool your sending reputation with other users. Dedicated IPs isolate your reputation so only your sending behavior affects deliverability.
Does Inframail include email warmup?
No. You'll need an external warmup tool like TrulyInbox ($29/month unlimited) or Warmup Inbox ($15/month per inbox).
Can I use Inframail with Google Workspace?
No. Inframail is Microsoft-only infrastructure. For Google Workspace integration, consider Maildoso or Mailforge.
How long does Inframail setup take?
Users report 10 minutes or less for complete setup including DNS configuration and inbox creation.
What happens if my IP gets blacklisted on Inframail?
Inframail's deliverability monitoring dashboard tracks blacklist status and auto-submits delisting requests.
Key terms glossary
Dedicated IP: An IP address assigned exclusively to your sending. Your behavior alone affects reputation.
Shared IP pool: Multiple senders using the same IP addresses. One bad sender can damage everyone's deliverability.
DNS propagation: The time required for DNS record changes (SPF, DKIM, DMARC) to spread across the internet. Typically 24-48 hours manually.
Flat-rate pricing: A fixed monthly cost regardless of usage volume. Inframail charges $129/month whether you have 50 or 500 inboxes.
TCO (Total Cost of Ownership): The complete cost including platform fees, domain costs, warmup tools, and any add-ons.
SPF/DKIM/DMARC: Email authentication protocols that verify sender identity and protect against spoofing.
