Maildoso vs Inframail: Google Workspace vs Unlimited Microsoft for Cold Email
Maildoso offers shared Google Workspace. Inframail offers unlimited Microsoft 365 at a flat rate. Neither offers both. Here's how they compare for cold email infrastructure.
Two Budget Providers, Two Completely Different Platforms
Maildoso and Inframail sit at opposite ends of the email provider spectrum. Maildoso gives you Google Workspace inboxes on shared infrastructure. Inframail gives you unlimited Microsoft 365 inboxes at a flat monthly rate. If you're choosing between these two, you're really choosing between platforms. And that choice affects your deliverability in ways that go beyond what either provider tells you.
I've tested both providers side by side. Same email copy, same prospect lists, same sending platform. Here's what the data shows and where both fall short.
Maildoso: Google Workspace on Shared Infrastructure
Maildoso (getmaildoso.com) offers Google Workspace inboxes at $2 to $3 per inbox. That's cheap compared to Google's direct pricing of $7 per user per month. The trade-off is shared infrastructure. Multiple Maildoso customers send from the same Google Workspace organization, which means your sending reputation is partially tied to the behavior of other users on the same setup.
In our testing, Maildoso inboxes delivered 35% to 45% inbox placement on GlockApps within the first month. That's below the 55% to 65% we'd expect from properly configured standalone Google Workspace accounts. The shared infrastructure is the likely culprit. When another sender on your shared pool runs sloppy campaigns, your inboxes absorb some of the reputational damage.
Maildoso does not offer pre-warming. Inboxes arrive cold. You need a separate warmup tool ($15 to $20 per inbox per month) and 14 to 21 days of warmup before you can start sending cold email. DNS setup is basic. Some inboxes ship with DMARC set to p=none, which provides no protection and no positive signal to receiving servers.
Maildoso strengths: Low per-inbox cost, Google Workspace platform (good for sending to Gmail recipients).
Maildoso weaknesses: Shared infrastructure, no pre-warming, no Outlook, inconsistent DNS, email-only support with 24 to 48 hour response times.
Inframail: Unlimited Microsoft at a Flat Rate
Inframail (inframail.io) takes a different approach. Instead of charging per inbox, they offer unlimited Microsoft 365 inboxes at a flat monthly rate (typically $99 to $149 per month). For agencies managing hundreds of inboxes, the math looks incredible on paper.
The reality is more nuanced. Inframail only offers Microsoft 365. No Google Workspace option at all. Since roughly 60% of B2B email runs on Google (Gmail), sending exclusively from Microsoft inboxes means your deliverability to the majority of your prospect list is suboptimal. Microsoft to Gmail deliverability is measurably lower than Google to Gmail.
In our testing, Inframail inboxes delivered 48% to 58% inbox placement on GlockApps. Decent for Microsoft inboxes, but the lack of Google Workspace means you're leaving deliverability on the table for over half your prospect list.
Inframail does not offer pre-warming either. You're responsible for warming every inbox yourself, which at "unlimited" volumes can mean managing warmup for 50 to 100+ accounts simultaneously. That's $750 to $2,000 per month in warmup tools alone.
Inframail strengths: Unlimited inboxes at flat rate, good for high-volume Microsoft-only setups.
Inframail weaknesses: Microsoft only (no Google), no pre-warming, warmup costs scale linearly, email-only support.
Head to Head Comparison
| Feature | Maildoso | Inframail |
|---|---|---|
| Platform | Google Workspace | Microsoft 365 |
| Pricing | $2 to $3/inbox | Flat rate ($99 to $149/mo, unlimited) |
| Infrastructure | Shared | Dedicated (Microsoft) |
| Pre-warming | No | No |
| DNS quality | Basic (may need fixes) | Included |
| Inbox placement (tested) | 35% to 45% | 48% to 58% |
| Support | Email (24 to 48h) | |
| Google Workspace | Yes | No |
| Outlook/Microsoft 365 | No | Yes |
The Core Problem: Neither Offers Both Platforms
This is the fundamental issue with choosing between Maildoso and Inframail. You're picking one email platform and ignoring the other. The data consistently shows that running both Google Workspace and Outlook 365 improves overall deliverability by 10% to 15% compared to using either platform alone. Google to Gmail delivers better. Microsoft to Outlook delivers better. Matching your sending platform to your recipient's platform is the easiest deliverability win available.
Maildoso gives you Google but no Outlook. Inframail gives you Outlook but no Google. Either way, you're sending suboptimally to roughly 40% to 60% of your prospect list.
The True Cost Comparison
Maildoso (30 inboxes):
- Inboxes: 30 x $2.50 = $75
- Warmup: 30 x $17.50 = $525
- DNS fix time: 2 to 3 hours
- Monthly total: ~$600
Inframail (30 inboxes):
- Flat rate: $99 to $149
- Warmup: 30 x $17.50 = $525
- Monthly total: ~$625 to $675
Puzzle Inbox (30 pre-warmed, mixed Google + Outlook):
- 18 Google Workspace x $4.50 = $81
- 12 Outlook x $0.50 = $6
- Warmup: $0 (included)
- DNS fixes: $0 (verified)
- Monthly total: $87
The budget providers end up costing 6x to 7x more per month when you factor in warmup. And neither gives you the platform diversity that maximizes deliverability.
When Each Provider Makes Sense
Maildoso makes sense if: You're testing cold email with 5 to 10 inboxes, your budget is extremely tight, and you're comfortable managing warmup and DNS yourself. Don't expect premium deliverability.
Inframail makes sense if: You need 50+ Outlook inboxes and your prospect list is heavily Microsoft (financial services, government, enterprise). The flat rate pricing becomes genuinely good value at 100+ inboxes, as long as you accept the Microsoft-only limitation.
For everyone else: A provider offering both Google Workspace and Outlook with pre-warming gives you better deliverability at lower true cost. The savings on warmup tools alone covers the per-inbox price difference.