Feature comparison
| Feature | MailStrike | Warmup Inbox |
|---|---|---|
| Automated warmup | ✓ Yes | ✓ Yes |
| Google Workspace integration | ✓ Yes | ✓ Yes |
| Microsoft 365 integration | ✓ Yes | ✓ Yes |
| Volume model | Monthly allocation | Daily caps per plan |
| 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 | — |
| Company description personalised sending (AI-powered) | ✓ Yes | — |
| Rescues from spam (documented) | ✓ Documented | — |
| Marks as important | ✓ Yes | ✓ Yes |
| Dashboard surfaces | Readiness score, 90-day placement chart, live activity feed | Reputation score, blacklist monitoring |
| Multi-language warmup | English | ✓ 12 languages |
| Free Email Auth Checker | ✓ SPF / DKIM / DMARC / MX / BIMI | — |
| Free Blacklist Checker | ✓ 21 blacklists | — |
| Free SPF / DKIM / DMARC generators | ✓ All three | — |
| Free Email Template Analyser | ✓ 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. Warmup Inbox sets a daily ceiling by plan tier. MailStrike runs on monthly allocation, so the warming engine concentrates sends when the network engages best and a single mailbox doesn't produce the same flat profile every day. Receivers see the monthly footprint.
Who the mailboxes pretend to be. Without persona differentiation, every mailbox on a domain warms with the same fingerprint. MailStrike runs four personas (Fast Scanner, Avg Reader, Thorough Reader, Mobile-First), one assigned to each mailbox. Different reply rates, different dwell, different hours. Three mailboxes, three personas: that's a team.
What the mailboxes write about. MailStrike generates warmup content from your industry and company description, so the language reflects what your domain actually does. Generic warmup content reads as generic warmup content.
Languages and tools. Warmup Inbox is the one tool in the category with 12-language warmup, which is genuinely useful for non-English outreach. MailStrike trades that for a free diagnostic toolkit alongside warming: Auth Checker, Blacklist Checker, record generators, template analyser.