Feature comparison
| Feature | MailStrike | Warmy |
|---|---|---|
| Automated warmup | ✓ Yes | ✓ Yes |
| Google Workspace integration | ✓ Yes | ✓ Yes |
| Microsoft 365 integration | ✓ Yes | ✓ Yes |
| Volume model | Monthly allocation | Daily ramp (~200/day in 20 days) |
| AI personas (behaviour signalling) | ✓ Fast Scanner, Avg Reader, Thorough Reader, Mobile-First | — |
| Multi-mailbox team simulation | ✓ Distinct persona per mailbox | — |
| Industry personalised sending (AI-powered) | ✓ Yes | Topic selection per mailbox |
| Company description personalised sending (AI-powered) | ✓ Yes | — |
| Rescues from spam (documented) | ✓ Documented | ✓ Documented |
| Marks as important | ✓ Yes | — |
| Dashboard surfaces | Readiness score, 90-day placement chart, live activity feed | Placement, IP/domain reputation, Postmaster, bounce rate |
| Multi-language warmup | English | ✓ 30+ languages |
| Free Email Auth Checker | ✓ SPF / DKIM / DMARC / MX / BIMI | — |
| Free Blacklist Checker | ✓ 21 blacklists | — |
| Free SPF / DKIM / DMARC generators | ✓ All three | SPF, DMARC |
| Free Email Template Analyser | ✓ Yes | ✓ Yes |
| Continuous warming alongside campaigns | ✓ Yes | ✓ Yes |
Cells marked “—” aren't documented in publicly available product material at time of writing.
Where they actually diverge
The cadence. Warmy ramps mailboxes toward a 200/day temperature over roughly twenty days. MailStrike works on monthly allocation, so daily volume can vary the way a real domain's does. Quieter on weekends, busier mid-week, no flat curve.
Who the mailboxes pretend to be. Warmy's “Adeline” engine builds a per-mailbox warming plan based on sending activity. MailStrike takes a different approach: four named personas (Fast Scanner, Avg Reader, Thorough Reader, Mobile-First), each with distinct reply rates, dwell times, and active hours. The point is behavioural diversity across a domain's mailboxes, not just per-mailbox tuning.
What the mailboxes write about. Warmy lets you select a topic for each mailbox (real estate, finance, and so on). MailStrike generates content using your industry and company description together, so the warming mail reflects what your specific business does rather than a generic category. Both attempt content personalisation; one is broader, one is sharper.
Languages and tools. Warmy supports warming in 30+ languages, easily the broadest in the category. MailStrike is English-only. On free diagnostic tools, both publish a stack: Warmy has SPF and DMARC generators plus a template checker; MailStrike adds a DKIM generator, a unified Auth Checker covering SPF/DKIM/DMARC/MX/BIMI in one pass, and a Blacklist Checker across 21 lists.