COMPARISON

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)	Email
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.

Verdict: Maildoso and Inframail are each half a solution. Maildoso gives you Google without Outlook. Inframail gives you Outlook without Google. Neither offers pre-warming, which means both require $15 to $20 per inbox per month in warmup costs. Puzzle Inbox offers both platforms with pre-warming included, delivering better inbox placement at significantly lower true cost. If you're choosing between Maildoso and Inframail, the real question is whether a provider that offers both platforms would serve you better.

Maildoso vs Inframail: what cold email operators actually need to compare

Most "Maildoso vs Inframail" comparisons online compare feature checkboxes. Cold email operators making this decision in 2026 need to weigh five things instead: per-seat cost at their actual user count, deliverability on the prospect-list region they target, integration friction with the sending tool already in the stack, support response time during a live deliverability incident, and the contract structure (annual versus monthly, refund flexibility, hidden warmup add-ons).

Pricing comparison: Maildoso vs Inframail

Headline pricing is the first thing most buyers see, but real total cost of ownership depends on what is bundled and what is an add-on. For Maildoso and Inframail, the dimensions to model carefully are: per-seat cost on the smallest viable plan, the price step from the entry tier to the next tier (where most growth-stage teams end up), credits or sending limits that bottleneck heavy users, warmup tool subscriptions sold separately, deliverability monitoring add-ons, and any minimum-order constraints that inflate the entry point. Pull current pricing directly from the vendor pricing pages; both vendors update tiers quarterly in 2026.

Deliverability and sending infrastructure

For tools in the cold email infrastructure category, the upstream question is which underlying mailbox provider the sending traffic actually leaves from. Real Google Workspace and Microsoft 365 mailboxes inherit Google's and Microsoft's own IP reputation. Custom SMTP infrastructure does not. India-region Workspace tenants carry different region-level reputation signals from US or EU region tenants. If Maildoso and Inframail differ on this dimension, that single difference outweighs most of the feature comparison. For sending tools and lead data tools, the upstream question is whether the product gracefully connects via OAuth to real GWS / M365 mailboxes from a provider like Puzzle Inbox.

Integration friction with the existing stack

Most operators do not pick Maildoso or Inframail in isolation. The decision is shaped by what the rest of the stack already runs on. If the team is on Smartlead or Instantly for sending, the integration story is more important than any standalone feature comparison. If the team is on Apollo or Clay for data, the export and webhook compatibility matters more than the prospect database size. The right comparison framework is: "Which one breaks least when bolted onto our existing stack?" not "Which one has more features on a vendor demo deck?"

Support and incident response

Both Maildoso and Inframail have public support channels. The dimension that separates them is response time during a live incident — a deliverability drop mid-campaign, a sudden bounce-rate spike, an account suspension. Test this before signing by opening a real support ticket on a free trial or paid plan. The vendor that responds in hours instead of days is the one that survives contact with a real cold email operation.

Where Puzzle Inbox fits

Whichever of Maildoso or Inframail the team picks, the sending infrastructure layer is upstream of the tool decision. Puzzle Inbox provisions real Google Workspace and Microsoft 365 cold email mailboxes on dedicated tenants, ships pre-warmed inventory in 24 to 72 hours, and connects via OAuth (email + password) to every sending tool in this comparison. See the pricing page, Google Workspace plans, or Outlook 365 plans for current per-inbox numbers. Reviews follow our published editorial methodology.

Maildoso vs Inframail FAQ

Which is cheaper, Maildoso or Inframail?

The cheaper of Maildoso and Inframail at your specific seat count depends on the tier each vendor places you on. Pull current pricing from both vendor pricing pages on the same day and run the math at your actual user count, your actual sending volume, and your actual feature requirements. The cheaper headline number is often not the cheaper effective cost once add-ons and seat tiers are factored in.

Which has better deliverability, Maildoso or Inframail?

Deliverability is mostly a function of the sending mailbox provider (Google Workspace, Microsoft 365, or custom SMTP) rather than the tool layered on top. If Maildoso and Inframail both connect to real GWS or M365 mailboxes, the deliverability difference is small. If one of them is custom SMTP infrastructure and the other is real GWS / M365, the gap is large.

Can I switch between Maildoso and Inframail later?

Both vendors export contact data, campaign history, and reply data in standard formats. Migration friction is mostly in re-onboarding the team on the new UI rather than data portability. Budget a week for the switch.

What is a good alternative to Maildoso and Inframail?

The alternatives most cold email operators evaluate alongside Maildoso and Inframail live in the same category. See the tools directory for the full category list and the comparisons directory for related head-to-heads.

Ready to start sending?

Puzzle Inbox provisions pre-warmed Google Workspace and Outlook 365 cold email inboxes ready to send within 24-72 hours. See the pricing page, the how-it-works walkthrough, or the our-process page for full details. Comparisons follow our editorial methodology.