Warmy.io is one of the most heavily marketed email warmup tools, with aggressive SEO content, a large claimed network ("100,000+ mailboxes"), and pricing that positions it as a premium option. We ran a 30-day test across 5 mailboxes to see whether the claims hold up - and specifically whether the large network size translates into better inbox placement outcomes.
The Network Size Claim
Warmy claims 100,000+ mailboxes in their warmup network. This is a compelling number - but raw network size is not the same as network quality. In our testing, the warmup emails we received from Warmy's pool came from a narrower range of domains and ESPs than expected from a 100,000-account network. This suggests either the stated number is aspirational, or a large portion of the pool is inactive or low-quality.
What matters for inbox placement is not how many mailboxes are in the pool, but: (1) how actively they engage with warmup emails, (2) how diverse the pool is across Gmail, Outlook, Yahoo, and other ESPs, and (3) how human-like the engagement patterns look. A smaller, actively engaged pool often outperforms a large dormant one.
Warmy Inbox Placement Results
In our 30-day test with a fresh domain: Gmail inbox placement reached 86% by day 30, Outlook reached 90%. These are below-average results compared to competitors. MailReach hit 91% Gmail, LemWarm hit 88%, and MailPilot reached 95%. Despite the largest claimed network, Warmy delivered the second-lowest Gmail placement in our test group.
Warmy Pricing
- Solo: $49/month (1 mailbox)
- Business: $129/month (3 mailboxes)
- Agency: $279/month (5 mailboxes)
- Agency Max: $579/month (unlimited)
This is significantly more expensive than competitors. MailPilot's Growth plan at $99/month covers 25 mailboxes. Warmy's 25-mailbox equivalent would cost $279–579/month. The 5x price difference is not justified by the placement results we measured.
Warmy Pros
- Large stated network (though quality is unclear)
- Clean, polished dashboard UI
- AI-generated email content for warmup messages
- Multi-language warmup email support
- Good documentation and onboarding
Warmy Cons
- Most expensive option in the market at equivalent mailbox counts
- No real inbox placement monitoring - only an internal "deliverability score"
- No DNS health checker for SPF, DKIM, DMARC
- Below-average placement results despite the highest price
- 7-day trial is insufficient to measure meaningful warmup progress
- No free trial without a credit card on most plans
Bottom Line
Warmy.io charges a premium but doesn't deliver premium results. Its inbox placement outcomes were the second-worst in our test group despite the largest claimed network. For the budget Warmy charges for 5 mailboxes ($279/month), you could run 25+ mailboxes through MailPilot with better placement results, real inbox monitoring, DNS health checks, and a 14-day free trial with no credit card required.
Unless you specifically need multi-language warmup content and have an unlimited budget, Warmy is hard to recommend over the alternatives currently available in 2025.
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