Comparison
CEO and co-founder
Email Infrastructure Vendor Comparison: Inframail vs. Maildoso vs. Mailforge vs. Alternatives
TL;DR:
For agencies scaling past 50 inboxes, per-inbox pricing from Maildoso, Mailforge, and Google Workspace quietly destroys net margins. Our $129/month flat-rate plan covers unlimited inboxes on dedicated US-based IPs, with automated SPF/DKIM/DMARC configuration that cuts 12-15 hours of monthly DNS work down to minutes. At 100 inboxes, our platform fee stays at $129/month while Google Workspace platform costs run $840/month. If you run Microsoft-based cold email infrastructure at scale, we are the clear choice on cost, setup speed, and IP control.
Scaling from 50 to 200 inboxes on Google Workspace raises your infrastructure bill from $420 to $1,680 per month. Most agency founders discover this math too late, after per-inbox pricing has already consumed their net margin. Cold email infrastructure covers every technical layer that determines whether your outbound campaigns land in the inbox or spam: domain strategy, DNS authentication records (SPF, DKIM, and DMARC), IP reputation management, and the sending systems that connect everything together. This guide compares Inframail, Maildoso, Mailforge, and Google Workspace across true cost-per-inbox, setup speed, deliverability, and contract flexibility so you can protect your 20% net margins and launch client campaigns faster.
The vendor evaluation blueprint for agencies
Most agencies look only at headline cost and miss the total picture. Five criteria actually move your P&L:
True cost per inbox at 50, 100, and 200 scale, including platform fee, domain costs, and external warmup tools.
Deliverability performance measured with Mail-Tester scores and inbox placement rate data.
Setup time savings from automated DNS configuration versus manual panel work.
Contract flexibility to pilot infrastructure for 30 days before committing full spend.
Support quality when a client campaign drops to 45% inbox placement on a Thursday night.
Inbox rate evaluation for agencies
Inbox placement rate measures how many of your sent emails land in the primary inbox rather than spam or promotions, and that percentage determines whether your campaigns generate meetings or churn clients. Dropping from 80% to 55% inbox placement across a 10-client portfolio is not a technical nuisance, it is a client retention emergency. Agencies running 50-200 domains need a vendor that provides proactive blacklist monitoring, not reactive ticket responses after the damage happens. We report an 88% inbox rate using GMass's deliverability testing tool and a 9.5/10 Mail-Tester score, giving you a concrete baseline to hold any vendor accountable to.
Deliverability test parameters and scale
To get meaningful deliverability data, you need a minimum sample size of 10,000 sends tested across multiple domains and IP addresses, with test parameters disclosed: sending platform, recipient domain split, and warmup duration before testing. Mail-Tester scores reveal SPF, DKIM, and DMARC configuration quality. GMass inbox rate testing reveals where your emails actually land at scale. Any vendor quoting deliverability numbers without disclosing methodology is giving you marketing copy, not testable data.
Proof of deliverability claims
We report a 9.5/10 Mail-Tester score and 88% inbox rate via GMass testing, with both methodology and tool disclosed. Maildoso and Mailforge do not publish equivalent Mail-Tester or GMass inbox placement data with disclosed test parameters on their public-facing websites. When evaluating any vendor, request Mail-Tester screenshots and GMass inbox rate data from real campaigns before committing spend.
Protecting agency margins: profit per client
Most agency founders track monthly revenue and client count but miss the cost creep inside their infrastructure stack. A typical agency at 8 clients managing 70 inboxes on Google Workspace pays $588/month in inbox costs alone, before adding domain registrations, warmup tools, and their sending platform. That single line item can consume a substantial portion of a $2,000/month client retainer. The transition from fragmented, per-seat pricing to flat-rate consolidated infrastructure is where agencies recover substantial net margin.
Before: $588/month for 70 Google Workspace inboxes at $8.40/inbox, plus $15-50/month per inbox for external warmup tools, which can consume a significant portion of monthly billings and leave limited room to hire.
After: $129/month flat rate for unlimited inboxes on dedicated IPs, plus amortized domain costs, cutting infrastructure as a percentage of billings and making a $50k account manager financially viable.
Pricing for 50 outbound accounts
At 50 inboxes, the pricing spread between vendors is already significant, but the real divergence starts when you scale.
Platform fee only at 50 inboxes:
Vendor | Monthly Cost (50 inboxes) | Pricing Model |
|---|---|---|
Inframail | $129/month | Flat rate, unlimited |
Maildoso | ~$100-138/month | Per-inbox (~$2-2.75/inbox) |
Mailforge | ~$150/month | Per-inbox ($3/inbox) |
Google Workspace | $420/month | Per-inbox ($8.40/inbox) |
Add domain costs (50 domains at $9.44-16.44/year, approximately $39.35-68.50/month when amortized, platform + domains, warmup excluded):
Vendor | Total Monthly (50 inboxes + domains) |
|---|---|
Inframail | ~$197.50/month |
Maildoso | $125-205/month |
Google Workspace | $445-488/month |
At 50 inboxes, Google Workspace Business Starter costs $420/month at $8.40 per user on a monthly plan. We charge $129 flat plus approximately $68.50 in amortized domain costs (50 domains at $16.44/year), totaling approximately $197.50/month. That is approximately a $222.50/month difference, or roughly $2,670 annually, from a single pricing decision.
Scaling infrastructure for 100 domains
At 100 inboxes, per-inbox pricing compounds aggressively against your margins. Maildoso's pricing at volume runs approximately $2-2.75/inbox, totaling approximately $200-275/month in platform fees. Mailforge runs similarly at approximately $240-300/month. Our pricing stays at $129/month regardless of whether you provision 5 inboxes or 500.
TCO at 100 inboxes (platform + amortized domain costs, warmup excluded):
Vendor | Platform Fee | Domain Costs | Monthly Total |
|---|---|---|---|
Inframail | $129 | ~$137 | ~$266 |
Maildoso | ~$200-275 | ~$137 | ~$337-412 |
Mailforge | ~$240-250 | ~$137 | ~$377-387 |
Google Workspace | $840 | ~$137 | ~$977 |
Google Workspace Business Starter costs $840/month in platform fees alone at 100 inboxes. Our flat-rate model delivers substantial monthly savings at this tier before accounting for setup time savings.
200 accounts: vendor choice and ROI
At 200 inboxes, the math becomes undeniable. Maildoso's pricing at high volume reportedly drops toward approximately $1.80-2.75 per mailbox, putting 200 inboxes at an estimated $360-550/month in platform fees. Mailforge runs approximately $484/month at around $2.42/inbox at this tier. Our flat rate: $129/month. Google Workspace: $1,680/month.
Full TCO at 200 inboxes (platform + amortized domain costs, warmup excluded):
Vendor | Platform Fee | Domain Costs | Total Monthly |
|---|---|---|---|
Inframail | $129 | ~$274 | ~$403 |
Maildoso | ~$360-550 | ~$274 | ~$634-824 |
Google Workspace | $1,680 | ~$274 | ~$1,954 |
Our flat rate versus Google Workspace at 200 inboxes delivers substantial monthly savings. Even against Maildoso at competitive per-inbox rates, our flat rate delivers significant cost advantages at this tier.
Vendor fees: what you actually pay
Warmup tool gap: We do not include a built-in warmup tool. You need an external service like Warmbox or Lemwarm, which costs $15-50/month per inbox depending on the tool and volume. This is a real line item that belongs in your TCO calculation. Maildoso offers a warmup add-on as a separate paid feature. Mailforge includes built-in warmup functionality. Our Done-for-You Email Campaign Setup package at $299/month includes free domain warmup if you need a fully managed solution.
Contract billing: Maildoso recently added monthly billing to its plans alongside annual and quarterly options. We offer true month-to-month billing. Mailforge also offers flexible monthly billing.
Domain pricing: Domains through our platform cost $9.44-16.44/year. Factor in 2-3 domains per client for rotation and your domain line item runs $12-48/year per client, or $1-4/month per client amortized.
Real-world inbox placement rates
Shared IP pools work like carpool lanes where every driver affects your speed. One sender on your shared IP range getting flagged for spam takes your reputation down with them. Dedicated IPs isolate your sending behavior so inbox providers judge only your actions, not those of other senders sharing your range.
We provide dedicated US-based IPs: 1 on the Unlimited Plan ($129/month), 3 on the Agency Pack ($327/month). Maildoso uses shared IP infrastructure. Mailforge uses a shared IP pool. For agencies managing 8-15 clients with deliverability commitments, dedicated IP isolation protects your sender reputation at the infrastructure layer before any campaign goes live.
Best Mail-Tester scores by vendor
We score 9.5/10 on Mail-Tester across tested domains, confirming that SPF, DKIM, and DMARC records are correctly configured and that our sending infrastructure passes all major authentication checks. Maildoso and Mailforge have not published equivalent Mail-Tester scores with disclosed test parameters on their public-facing websites at the time of writing. A 9+/10 Mail-Tester score is the technical baseline any agency should require from a vendor before committing a client domain.
Inbox placement by platform
Using GMass's inbox deliverability testing tool, we report an 88% inbox rate. Maildoso and Mailforge have not published equivalent GMass inbox rate data with disclosed test parameters at the time of writing. Agency founders using our infrastructure report sustained reply rates that reflect real campaign performance:
"I've been using Inframail for a couple of months and the experience has been really good. 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." - Verified user review of Inframail (38 5-star reviews on Trustpilot)
Outbound email blacklist resolution
When a domain gets flagged, every hour matters. Our deliverability monitoring dashboard tracks domain and IP health in real time and auto-submits delisting requests when domains are flagged. The "phantom redirects" feature also masks domain redirects from email service providers, reducing detection risk.
Automated DNS: slash outbound setup time
Manual DNS configuration for 50 domains requires logging into GoDaddy, Namecheap, or Cloudflare for each domain, creating SPF, DKIM, and DMARC records individually, waiting 24-48 hours for propagation, and testing with Mail-Tester before any campaign can launch. That process can consume substantial hours per client onboarding. At 3 new clients per month, manual DNS work can block your sales pipeline entirely.
Client onboarding: manual vs. auto DNS
Manual process (GoDaddy or Cloudflare): 20-30 minutes per domain for SPF, DKIM, and DMARC creation, plus 24-48 hours propagation wait time, plus Mail-Tester verification before go-live. For a 15-domain client onboarding, manual setup can require multiple hours of active work and several days before campaign launch.
Our automated process: domain purchased or transferred, SPF/DKIM/DMARC records auto-configured, inboxes provisioned, IMAP/SMTP credentials exported to CSV, imported to Instantly.ai or Smartlead. No DNS panel access required at any step.
Vendor DNS automation: SPF/DKIM/DMARC
Vendor | DNS Automation | Setup Time (10 inboxes) | Manual Panel Work |
|---|---|---|---|
Inframail | Full auto (SPF/DKIM/DMARC) | ~10 minutes | None |
Maildoso | Partial auto | Not publicly disclosed | Minimal |
Mailforge | Auto per domain added | ~5-10 minutes | None |
Google Workspace | Manual | Substantial per domain | Full |
One verified Inframail user put it plainly: "I personally have over 1,000 email accounts" with Inframail for one flat price. Adding all those DNS records manually "would have probably taken dozens of hours. Instead all records were added within 10 minutes."
Monthly contracts: test before you commit
Vendor lock-in is the hidden cost that does not appear on any pricing page. Committing spend upfront before validating real client campaign deliverability for 30+ days is a gamble agencies with 15-20% net margins cannot afford. Run a 20-domain pilot with 2 real client campaigns over 45 days before migrating your full infrastructure.
Monthly vs. quarterly billing
Both we and Mailforge offer true month-to-month billing. Maildoso recently updated its plans to include a monthly subscription option alongside its existing annual and quarterly commitments. This is a meaningful change for cash-flow-sensitive agencies that want to validate performance before committing. Month-to-month billing makes the pilot economically rational: run our Unlimited Plan for 1-2 months at $129/month with no forced commitment before you validate deliverability performance on real client campaigns.
Cancel anytime: avoid vendor lock-in
The ability to right-size your infrastructure spend month-to-month ties directly to cash flow predictability. When a client churns, your infrastructure cost should move with your revenue, not stay fixed at a committed annual rate. Flexible billing is a structural risk management decision, not just a pricing preference.
Real agency gains: margin and time saved
The business case for flat-rate infrastructure is straightforward when you run the numbers against your current P&L. Agencies switching to our platform from Google Workspace on 50 inboxes recover $222.50/month in infrastructure savings. At 100 inboxes, that saving reaches $574/month, or $6,888 annually, money that funds warmup tool costs, a part-time hire, or drops straight to net margin.
Boost agency margins, cut hours
We hold a 5-star Trustpilot rating across 38 reviews. Maildoso holds a 4.6/5 G2 rating across 173 verified reviews, and Mailforge holds a 4.7/5 G2 rating across 81 reviews. Review volume differences reflect market age rather than quality gaps. What differentiates is review content: our Trustpilot reviews consistently cite setup speed, support response times, and sustained deliverability over months of use.
"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 (38 5-star reviews on Trustpilot)
Our advantages for agencies
Flat-rate pricing: $129/month for unlimited inboxes, no per-seat tracking.
Dedicated IPs: 1-3 US-based dedicated IPs protect sender reputation from shared pool contamination.
Automated DNS: No manual DNS panel work required for SPF/DKIM/DMARC.
Month-to-month: Cancel anytime, no forced annual commitment.
Microsoft enterprise partnership: Built on Microsoft's cloud platform with our publicly announced January 2024 partnership.
Our trade-offs
No built-in warmup tool (external service at $15-50/month per inbox required, or included in our DFY package).
Microsoft infrastructure only (no Google Workspace support).
US-based IPs only (no EU or APAC data residency).
Maildoso pros and cons
Pros: Lower per-inbox cost at high volume. Inbox health monitoring. 173 G2 reviews provide solid social proof.
Cons: Shared IP pools mean other senders affect your reputation. Warmup requires a separate paid add-on.
Mailforge pros and cons
Pros: Competitive per-inbox pricing at volume. Auto DNS configuration per domain. Monthly billing available. Built-in warmup functionality included.
Cons: Shared IP pool infrastructure. Per-inbox pricing still scales linearly with client growth.
Mitigating risk with reliable vendor support
When inbox placement drops mid-campaign, every hour of downtime is a direct threat to client retention. Dedicated versus shared pool infrastructure affects both deliverability and support escalation pathways.
Guaranteed support response times
Our support is available 16 hours every day from real people, with a verified user reporting a maximum 2-minute wait time. Priority support is included with paid plans.
"The support team are quick to help with any issues or queries - it's been a top notch experience with them, highly recommended if you're looking to build email infrastructure." - Verified user review of Inframail (38 5-star reviews on Trustpilot)
"Their customer support is excellent. They exhibit both politeness and thoroughness, consistently following up until they resolve my concerns completely." - Verified user review of Inframail (38 5-star reviews on Trustpilot)
Pick your agency's ideal email platform
Best for bootstrapped agencies under 50 inboxes
If you run fewer than 30 inboxes, the absolute cost difference between most flat-rate vendors may be manageable at this tier, and manual Google Workspace setup may be feasible. But if you onboard multiple clients monthly or expect to scale past 50 inboxes within 6 months, our flat-rate model means infrastructure cost does not change as you grow, making it the correct structural choice even at lower volume.
Vendor options for 100-200 inboxes
At 100+ inboxes, we win on total cost by a margin that is hard to rationalize against. At $266/month total versus $977/month on Google Workspace, the $711/month saving covers warmup tool costs three times over and still adds margin. Maildoso at $337-412/month and Mailforge at $377-387/month both sit between us and Google Workspace, but neither offers dedicated IP isolation, which means sharing reputation risk with other senders on their shared pool.
Faster setup for client onboarding
10 inboxes in 2 minutes. No DNS panel. DNS propagation happens in the background. Credentials exported to CSV and imported to Instantly.ai in one workflow. If your agency onboards 2-3 new clients per month and each client requires 10-15 domains, our platform can reclaim substantial monthly operations time that shifts directly to sales calls and client strategy work.
"Product works great, it's super easy to buy domains/inboxes, very easy to pair with smartlead (or another sender). The owner is really cool and down to help any time." - Verified user review of Inframail (38 5-star reviews on Trustpilot)
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FAQs
What does 100 inboxes actually cost per month across vendors?
We cost approximately $266/month at 100 inboxes ($129/month flat plus ~$137 in amortized domain costs). Google Workspace runs $977/month, Maildoso runs ~$337-412/month, and Mailforge runs ~$377-387/month, all before external warmup tools.
How do I set up email infrastructure without manual DNS work?
We automate SPF, DKIM, and DMARC record creation during domain setup with no DNS panel access required. The full process from domain purchase to IMAP/SMTP credentials in your sending platform takes under 10 minutes for 10 inboxes.
Can I test before committing to annual contracts?
Yes. We offer true month-to-month billing, and Mailforge does as well. Maildoso now offers a monthly billing option in addition to its annual and quarterly plans, so testing pilots before full commitment is possible across most vendors.
How do vendor deliverability scores compare?
We report 9.5/10 on Mail-Tester and 88% inbox rate via GMass testing with both tools and methodology disclosed. Maildoso and Mailforge do not publish equivalent Mail-Tester or GMass inbox rate data with disclosed test parameters on their public-facing websites.
Should agencies use dedicated or shared IPs?
Dedicated IPs isolate your sender reputation so only your sending behavior determines how inbox providers judge your domains. Shared IP pools expose you to reputation damage from other senders on the same range, which can drop inbox placement rates without any change to your own campaigns. We provide 1 dedicated US-based IP on the Unlimited Plan and 3 on the Agency Pack.
Key terms glossary
Cold email infrastructure: The technical stack that determines whether outbound emails land in the inbox or spam, covering domain setup, DNS authentication records (SPF, DKIM, DMARC), IP address management, and the SMTP/IMAP systems that send and receive messages. Agencies typically manage this stack across dozens of domains per client.
Dedicated IP: A single IP address assigned exclusively to your sending account, meaning your reputation is determined solely by your own sending behavior. We provide 1 dedicated US-based IP on the Unlimited Plan and 3 on the Agency Pack.
Shared IP pool: A range of IP addresses used simultaneously by multiple senders, where one sender's spam activity can negatively affect inbox placement rates for all other senders on the same IPs. Maildoso and Mailforge use shared IP pool infrastructure.
DNS propagation: The period, typically 24-48 hours, required for updated DNS records (SPF, DKIM, DMARC) to replicate across global DNS servers after configuration changes. Manual DNS setup requires waiting through this window before testing deliverability or launching campaigns.
