MailGenius is an email deliverability testing tool that flags spam triggers, broken code, and authentication issues (SPF, DKIM, DMARC, reverse DNS) before you send. The core test is free with several tests available without an account.
Pros & cons
✅ Pros
- Free core deliverability testing
- Checks authentication and spam triggers
- No account needed to start
⚠️ Cons
- Limited free tests
- Testing tool, not a warmup service
Who it's best for
Senders who want a free pre-send spam and authentication check.
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