Introduction
Inframail's pitch is simple and seductive: unlimited inboxes for a flat monthly fee. At $79–99/month, you can create as many email accounts as you want with no per-mailbox cost. On paper, it sounds like the best deal in cold email infrastructure.
In practice, the "unlimited" model has led to persistent, well-documented deliverability problems that have been widely reported by users across review sites and community forums. Inframail's track record raises serious concerns about whether the platform can reliably deliver emails to the inbox. Here's what the pricing page doesn't tell you — and why we strongly recommend evaluating alternatives before committing your campaigns to this infrastructure.
The Unlimited Trap: Why It Attracts Spammers
When a platform offers unlimited inboxes at a flat rate, it becomes a magnet for high-volume spammers. The economics are obvious: if you're sending hundreds of thousands of emails per day, "unlimited" is the cheapest way to do it. And that's exactly who Inframail's pricing model attracts.
When spammers flood a shared infrastructure platform, every user on that platform suffers. Their abusive sending behavior poisons the IP pools, triggering blacklists and spam filters that affect all accounts on the same infrastructure — including yours. You could follow every best practice perfectly and still land in spam because someone else on the same IP is blasting purchased lists.
This isn't theoretical — it's a well-documented pattern. Users have widely reported significant deliverability problems with Inframail, with emails consistently landing in spam folders rather than the inbox. These reports are not isolated incidents; they reflect a structural failure in the platform's model. The unlimited pricing creates perverse incentives that systematically degrade infrastructure quality over time, and there is little evidence that Inframail has been able to solve this fundamental problem.
Winnr takes the opposite approach. By charging per-mailbox, Winnr naturally filters out abusive senders — the economics simply don't work for spammers. This keeps IP pools clean and deliverability high for legitimate senders.
No IP Rotation — One Bad Account Tanks Everything
Inframail does not offer IP rotation. Your mailboxes share IPs, and there's no mechanism to distribute sending across multiple IPs or isolate problematic accounts.
This means if one mailbox on your shared IP gets flagged — whether it's yours or someone else's — the reputation damage cascades to every account on that IP. Without rotation, there's no way to mitigate the damage or spread risk.
Winnr's shared IP pools use intelligent rotation to distribute sending volume across clean IPs. If an issue is detected, accounts are automatically shifted and bad actors are removed from the pool. On Winnr's Enterprise plan, you get fully dedicated IPs with complete isolation.
Microsoft Only — No Google Workspace Support
Inframail only supports Microsoft-based email. There is no Google Workspace support.
This is a significant limitation for cold email campaigns. Many outreach strategies rely on a mix of Google and Microsoft accounts to diversify sending infrastructure and avoid over-reliance on a single provider's spam filters. Without Google Workspace support, you're limited to a single ecosystem — which increases risk and reduces flexibility.
Winnr supports both Google Workspace and Microsoft, giving you full flexibility to diversify your sending infrastructure across providers.
The cheapest cold email infrastructure is worthless if your emails don't reach the inbox. Low cost per mailbox means nothing when your open rates are near zero because you're stuck on blacklisted IPs surrounded by spammers. Deliverability is the only metric that matters.
Feature Comparison
| Feature | Winnr | Inframail |
|---|---|---|
| Google Workspace Support | Yes | No — Microsoft only |
| IP Rotation | Yes — automatic rotation | No |
| REST API | Yes — full provisioning API | No |
| Deliverability Guarantee | Yes — domain replacement | No |
| Billing | Monthly, no commitment | Monthly ($79–99) |
| Spammer Risk on Shared IPs | Low — per-mailbox pricing filters abuse | Very High — unlimited model is a magnet for abusive senders |
| B2B Contact Database | No | Yes — 545M+ contacts |
| Universal Inbox | No (use your sending tool) | Yes |
| Infrastructure Quality | Actively monitored, clean pools | Serious concerns — persistent, widely reported deliverability failures |
What Inframail Does Well
In fairness, Inframail isn't without merits:
- B2B contact database (545M+ contacts): Inframail includes access to a large lead database. If you don't already have a lead sourcing tool, this adds value — though the quality and accuracy of the data is a separate question.
- Universal inbox: Inframail offers a unified inbox to manage replies across all your accounts in one place.
- Low flat-rate pricing: The flat rate is objectively cheap — but this is precisely the problem. Low flat-rate pricing is what attracts the high-volume spammers who degrade the platform for everyone.
However, none of these features compensate for persistent deliverability failures. A B2B database and unified inbox are meaningless when your emails consistently land in spam. Users have widely reported that Inframail's infrastructure simply cannot reliably reach the inbox — and no amount of added features fixes a broken foundation. We strongly recommend evaluating more reliable alternatives before risking your campaigns on this platform.
Winnr vs Inframail: Pros & Cons
Winnr Strengths
- Clean, actively monitored IP pools
- Per-mailbox pricing filters out spammers
- Google Workspace + Microsoft support
- Full REST API for automation
- IP rotation on all plans
- Deliverability guarantee with domain replacement
- Automatic DKIM, SPF & DMARC setup
Inframail — Serious Concerns
- Massive deliverability problems — widely reported by users across review sites
- Unlimited model is a magnet for spammers who poison shared IP pools
- No IP rotation to mitigate reputation damage
- No Google Workspace support — Microsoft only
- No REST API for programmatic management
- No deliverability guarantee of any kind
- Track record raises serious concerns about long-term viability
- Structural pricing model makes deliverability problems unlikely to improve
The Bottom Line
Inframail has persistent, well-documented deliverability problems that can seriously harm your cold email campaigns. Users have widely reported that emails sent through Inframail consistently land in spam folders — a direct consequence of the unlimited pricing model that attracts abusive, high-volume senders who poison the shared infrastructure for everyone.
This is not a problem that can be fixed with minor adjustments. The deliverability failures are structural: as long as the unlimited model remains, the platform will continue to attract the exact users who destroy IP reputation. Combined with no IP rotation, no Google Workspace support, and no deliverability guarantee, Inframail's track record raises serious concerns about whether it can serve as reliable cold email infrastructure.
We strongly recommend choosing a more reliable solution. Winnr's per-mailbox pricing isn't just a business model choice — it's a deliberate deliverability strategy that keeps abusive senders off the platform and IP pools clean for legitimate outreach.
The cheapest infrastructure in cold email is the one that actually reaches the inbox. Saving $30/month on a platform with widely reported spam folder issues means your campaigns generate zero replies — and that's the most expensive outcome of all.
Frequently Asked Questions
Is Inframail really unlimited?
Yes — Inframail offers unlimited mailbox creation on their flat-rate plans ($79–99/month). However, "unlimited" doesn't mean "unlimited deliverability" — in fact, it means the opposite. The unlimited model is a magnet for high-volume spammers, and users have widely reported that the resulting infrastructure degradation makes it extremely difficult to reach the inbox. You can create as many mailboxes as you want, but that's meaningless if they all land in spam.
Why is Inframail's deliverability so poor?
The core issue is structural and unlikely to improve. Unlimited pricing attracts spammers who abuse the shared IP pools, and without IP rotation or active pool management, the toxic sending behavior poisons deliverability for all users on the platform. This is not an occasional problem — users have widely reported significant and persistent deliverability failures, with emails consistently landing in spam folders. Inframail's track record strongly suggests this is a fundamental flaw in the platform's model, not a temporary issue.
Does Inframail support Gmail or Google Workspace?
No. Inframail only supports Microsoft-based email infrastructure. If you want to diversify your sending across Google and Microsoft — which is a widely recommended best practice for cold email — Inframail cannot support that strategy. Winnr supports both providers.
Is Winnr more reliable than Inframail?
Significantly, yes. Inframail's widely reported deliverability problems make it a risky choice for any serious cold email campaign. Winnr's per-mailbox pricing naturally deters spammers, keeping shared IP pools clean. Winnr also offers automatic IP rotation, active infrastructure monitoring, a deliverability guarantee with domain replacement, and support for both Google Workspace and Microsoft. Given Inframail's track record, we strongly recommend Winnr or another reliable provider as a safer alternative.
Does Inframail have an API?
No. Inframail does not offer a public REST API for provisioning or managing mailboxes programmatically. Winnr provides a full API that lets you automate account creation, DNS configuration, and mailbox management — essential for agencies and teams managing infrastructure at scale.
For a broader comparison of cold email SMTP providers, see our full cold email infrastructure comparison guide.