Cold Emailing
CEO and co-founder
Email Deliverability Tools Comparison: Inframail vs Maildoso vs Mailforge
TL;DR: For agencies scaling past 50 inboxes, flat-rate infrastructure with dedicated IPs protects margins and isolates your sender reputation from shared pool risks. Inframail charges $129/month regardless of inbox count, includes automated DNS configuration, and provides 1-3 dedicated IPs depending on your plan. Maildoso uses per-inbox pricing ($3.1/mailbox at entry tier) with shared IPs and requires quarterly minimums. Mailforge runs $2-3 per mailbox monthly on shared infrastructure with month-to-month flexibility. If you want predictable costs and reputation control as you scale, flat-rate dedicated IP infrastructure wins.
Most agencies obsess over cold email copy while ignoring the infrastructure costs consuming significant portions of their client retainers. I've watched agency founders spend hours configuring SPF/DKIM/DMARC records across Namecheap and GoDaddy panels, only to see their Google Workspace bills cross $490-588/month for 70 inboxes. That's before adding warmup tools at $15-50 per inbox.
I compare Inframail, Maildoso, and Mailforge through a strict operational lens, breaking down setup times, domain management automation, authentication support, cost structures, and real inbox placement performance so you can protect your margins and scale your client base without infrastructure becoming the bottleneck.
Quick verdict on Inframail, Maildoso, and Mailforge
Bottom line: For agencies managing 50-200 domains, Inframail's flat-rate pricing ($129/month unlimited inboxes) combined with dedicated IPs creates predictable costs and isolated sender reputation as you scale.
Before flat-rate infrastructure: You're juggling four fragmented vendors (domain registrar, inbox provider, warmup tool, sending platform), watching per-inbox costs grow faster than client revenue, and spending weekends emergency-rotating domains when deliverability drops with no warning system.
After switching: Domain purchase to live inbox takes under 10 minutes with automated DNS configuration, infrastructure costs stay fixed regardless of client growth, and dedicated IP monitoring catches blacklist issues before clients notice.
What makes up a reliable cold email infrastructure
Cold email infrastructure encompasses five interconnected components: email authentication protocols (SPF, DKIM, DMARC), domain portfolio management, inbox provisioning, warmup services, and deliverability monitoring. Getting this right determines whether your campaigns hit strong inbox rates or trigger client churn when deliverability crashes overnight.
Domain reputation drives inbox placement more than any other factor across Gmail, Microsoft, and Yahoo inboxes. Data quality, authentication setup, and sending behavior all feed into this reputation calculation. Most agencies fail not because of bad copy but because infrastructure decisions made at setup compound into deliverability problems months later.
The role of SPF, DKIM, and DMARC authentication
SPF (Sender Policy Framework) functions like a list of approved senders. It enables domain owners to define which email servers can send on their behalf, and receiving servers check this list before accepting messages.
DKIM (DomainKeys Identified Mail) works like a tamper-proof seal. It uses cryptography to mathematically verify that emails actually came from your domain and weren't modified in transit.
DMARC (Domain-based Message Authentication, Reporting and Conformance) tells receiving servers what to do after checking SPF and DKIM results. It instructs email receivers on how to handle unauthenticated emails, whether to quarantine, reject, or deliver them.
Manual authentication setup can take days for those who aren't proficient in email protocols. With platforms like Inframail, you can complete DNS setup in seconds rather than spending hours per domain in DNS panels.
Domain and inbox volume strategy
Industry experts recommend 2-6 inboxes per domain as the sweet spot for most cold email campaigns. This distributes sending volume and reduces the risk of burning an entire domain portfolio from a single campaign issue.
New domains should start with 10-20 emails per day and increase gradually by 20-50 emails weekly. Established domains with good reputation can safely send 40-100 emails daily. Industry guidance suggests 30-50 emails per day maximum per email account as a safe limit, with 3 email accounts per domain.
The risk of per-inbox pricing becomes clear at scale: 50 inboxes on Google Workspace at $8.40/user runs $420/month. Scale to 100 inboxes and you're at $840/month. At 200 inboxes, infrastructure alone costs $1,680/month while client revenue rarely scales linearly.
Warmup periods and related deliverability tools
Email warmup now requires a minimum of two weeks, but optimal results take 2-4 weeks. During this period, inboxes gradually build sending reputation through controlled email exchanges before running full campaigns.
Warmup tool costs vary significantly. MailReach starts at $25 per mailbox monthly, while Warmbox Solo costs $15 monthly for one inbox. Sending platforms like Instantly include unlimited warmup in paid plans starting at $37/month, which removes this as a separate line item. Smartlead offers similar bundling at $32.50-94/month depending on billing cycle.
Related services in the ecosystem include SendForensics for deliverability testing, Mailtrap for email previewing, and Warmy for inbox warming. The key decision is whether you want these bundled or prefer best-of-breed tools connected to your infrastructure.
Feature comparison of top deliverability platforms
Feature | Inframail | Maildoso | Mailforge |
|---|---|---|---|
Pricing Model | $129/month (Unlimited Plan, flat rate) or $327/month (Agency Pack) | $100/mo for 32 mailboxes ($3.1/inbox), scales to $733/mo for 400 ($1.8/inbox) | $2-3 per mailbox/month |
IP Type | Dedicated (1 IP Unlimited, 3 IPs Agency Pack) | Shared IP pool | Shared IP pool |
DNS Automation | Full auto-config | Auto-setup with option to bring own domains | Auto SPF/DKIM/DMARC |
Contract Terms | Month-to-month, cancel anytime | Requires contract commitment (details vary) | Month-to-month, cancel anytime |
The fundamental difference lies in IP allocation strategy. Dedicated IPs isolate reputation so your behavior alone determines inbox placement, while shared pools mean other senders on your IP range affect your deliverability.
Inframail vs Maildoso vs Mailforge: Head-to-head analysis
All three platforms solve the core problem of provisioning cold email infrastructure faster than manual setup through Google Workspace or Microsoft 365. However, the underlying architecture differs significantly in ways that impact both cost trajectory and deliverability outcomes.
Inframail uses Microsoft's cloud platform with dedicated US-based IPs, charging a flat $129/month regardless of inbox count. Maildoso prices per mailbox starting at $3.1 each (32 mailbox minimum at $100/month), scaling down to $1.8 per mailbox at 400 mailboxes for $733/month. Mailforge sits between $2-3 per mailbox on shared infrastructure.
"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
Setup time and DNS automation
Speed to live inbox matters when you're onboarding new clients or rotating domains. I tested setup workflows across all three platforms to measure actual time from domain purchase to campaign-ready status.
Inframail: Users consistently report sub-10-minute setup for 10 inboxes. The platform advertises "From Domains to Inboxes in 180 seconds," and customer testimonials confirm this holds true in practice. The setup tutorial demonstrates the full workflow without manual DNS configuration.
Maildoso: Domains and mailboxes go live within 10-15 minutes without manual DNS work. You can also connect your own domains if you prefer existing registrar relationships. Setup is straightforward but requires committing to their minimum contract terms before testing at scale.
Mailforge: Claims setup of hundreds of domains and emails with all technical requirements in approximately 5 minutes. The platform handles domain purchasing, DNS settings, inbox creation, and forwarding in one place.
IP reputation and deliverability monitoring
The dedicated vs shared IP debate centers on control over your sending reputation. On shared IPs, bad actors impact everyone sharing that pool. This "noisy neighbor" risk isn't theoretical.
Inframail provides dedicated IPs (1 on Unlimited Plan, 3 on Agency Pack) with a deliverability monitoring dashboard showing which domains are blacklisted. The platform auto-submits delisting requests.
Maildoso shows inbox health across Gmail, Outlook, and other providers with clear deliverability breakdowns. However, shared IP allocation means your reputation depends partly on other users' sending behavior.
Mailforge uses a shared IP pool that distributes mailbox accounts among millions of businesses similar to Gmail or Outlook infrastructure. Limited native monitoring features are available compared to dedicated IP solutions.
"We spent months hunting for a reliable cold-emailing stack. After repeated failures with another provider, we trialled two options—Inframail and a competitor. We chose the competitor. A month later, we switched back to Inframail. Rock-solid infrastructure, sharp support, genuinely dependable." - Verified user review of Inframail
Integration differences with sending platforms
Cold email infrastructure is only valuable if it connects smoothly to your sending platform. All three tools support major platforms, but the export workflows differ.
Inframail exports to major platforms including Instantly.ai, Smartlead, ReachInbox, Plusvibe, SalesHandy, Reply.io, and Woodpecker.
Maildoso integrates with tools like Instantly with pairing described as smooth and requiring no extra effort. The connection process follows standard IMAP/SMTP credential sharing.
Mailforge claims integration with any email software including Salesforge, working with existing tool stacks without forcing platform changes.
The 2025 infrastructure guide covers the full integration workflow from infrastructure setup through campaign launch.
Pricing analysis and total cost of ownership
Headline pricing tells an incomplete story. True infrastructure cost includes platform fees, domain costs, warmup tools, and sending platform subscriptions. I built a TCO model across three common agency scales.
Component breakdown:
Platform fee: Variable by provider and tier
Domain costs: $9-17 per domain annually (.com domains are $16.44/yr and .info domains are $9.44/yr) through most registrars, or $5 per domain transfer through Inframail (free on quarterly/annual plans)
Warmup tools: $15-50 per inbox/month if not bundled, or included with sending platforms like Instantly ($37/month) or Smartlead ($32.50-94/month)
Sending platform: $32.50-94/month depending on tier and features
Scale | Inframail | Maildoso | Google Workspace |
|---|---|---|---|
50 inboxes | $129/month platform + ~$34/month domains = $163/month | $100-138/month (32-50 mailbox tier) | $350-420/month at $7-8.40/seat |
100 inboxes | $129/month platform + ~$45/month domains = $174/month | est. $200-275/month (scaled pricing) | $700-840/month |
200 inboxes | $129/month platform + ~$90/month domains = $219/month | est. $400-550/month | $1,400-1,680/month |
Note: Domain costs calculated at 2-3 inboxes per domain using $13-16/year amortized monthly.
Infrastructure as percentage of billings tells the real story. In a scenario where an agency bills $2,500/month average per client with 10 clients (50 total inboxes at $25,000 total monthly billings), Inframail infrastructure would represent approximately 0.65% of billings ($163/$25,000). Google Workspace would consume 1.4-1.68% ($350-420/$25,000). Maildoso would sit at approximately 0.4-0.55% ($100-138/$25,000). Scaling to 200 inboxes across 40 clients at $100,000 monthly billings, Inframail would drop to about 0.22% ($219/$100,000), Google Workspace would remain at 1.4-1.68% ($1,400-1,680/$100,000), and Maildoso would run approximately 0.4-0.55% ($400-550/$100,000).
For agencies at 50 inboxes, switching to Inframail saves $187-257/month versus Google Workspace, or $2,244-3,084 annually.
"So affordable that it will make your unit economics work, even for lower ticket b2b businesses like ours" - Verified user review of Inframail
The contract flexibility difference also impacts cash flow. Inframail offers month-to-month billing with no annual commitment. Maildoso reportedly requires annual or three-month minimums. Mailforge also offers month-to-month flexibility. This matters when you want to validate performance before committing infrastructure budget.
Use-case breakdown: Which platform fits your agency
Choose Inframail if:
You manage 50-200 domains across multiple clients and need predictable costs that don't scale with inbox count
Dedicated IP reputation isolation is a priority because you've experienced shared pool deliverability issues
Month-to-month flexibility matters for testing before committing, and you want to pilot with real campaigns before annual lock-in
You need direct access to support with fast response times
Choose Maildoso if:
You're comfortable with per-inbox pricing and your scale stays under 50 mailboxes where the cost difference is minimal
Shared IP risk is acceptable because you're diversifying sending across multiple infrastructure providers
Quarterly commitment fits your budgeting cycle and cash flow planning
Choose Mailforge if:
You want the lowest per-mailbox cost and can accept shared infrastructure trade-offs
Integration with Salesforge ecosystem is a priority for your tech stack
You're testing cold email at smaller scale before scaling infrastructure investment
"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
Bottom-line recommendation for agency founders
For agencies scaling beyond 50 inboxes, the infrastructure decision comes down to cost predictability and reputation control. Flat-rate pricing with dedicated IPs gives you both, while per-inbox models on shared pools create margin pressure and deliverability risk as you grow.
We charge $129/month regardless of inbox count, so adding 5 new clients doesn't double your infrastructure costs. Our dedicated IPs mean when deliverability drops, you know the issue is your copy, your list, or your sending patterns, not some stranger in a shared pool triggering spam filters.
The Jackson Williams case study demonstrates what's possible when infrastructure stops being the bottleneck and you can focus on campaign optimization instead.
Sign up to Inframail and get started today.
Frequently asked questions
How long does DNS propagation take with automated setup?
Inframail's automated DNS setup reportedly completes SPF, DKIM, and DMARC configuration faster than traditional manual setup through registrar panels, which typically takes 24-48 hours for propagation plus configuration time per domain.
What inbox placement rates should I expect?
Your inbox placement rates will vary based on sending behavior, list quality, and copy. Industry benchmarks for cold email infrastructure typically range from 75-90% inbox rate depending on these factors.
Can I test before committing to annual plans?
Inframail offers month-to-month billing with no annual commitment and no cancellation penalties. Some competitors require minimum contract terms.
How many inboxes should I run per domain?
Industry recommendation is 2-6 inboxes per domain with 30-50 emails per day maximum per inbox as a safe limit. This distributes volume and protects your domain portfolio from single-point failures.
Key terminology
Dedicated IP: An IP address allocated exclusively to your sending infrastructure, meaning your reputation depends only on your sending behavior rather than other users sharing the same IP range.
Shared IP Pool: Multiple senders share the same IP addresses, which reduces costs but creates "noisy neighbor" risk where other users' poor practices can affect your deliverability.
DNS Automation: Software that automatically configures SPF, DKIM, and DMARC records without manual entry into domain registrar panels, reducing setup time from hours to seconds.
Inbox Placement Rate: The percentage of emails that land in recipients' primary inbox versus spam folder or promotions tab, measured through deliverability testing tools like GMass (for seed testing) or Mail-Tester (for spam score checking and configuration validation).
Social Proof
Inframail now has 38 5-star reviews on Trustpilot (https://www.trustpilot.com/review/inframail.io).
