Mail Server Health Check
Mail server health check — SPF, DMARC, MX hosts, reverse DNS, forward-confirmed PTR, and IP blocklist status in one deliverability report.
About this tool
When mail bounces or lands in spam, the problem is often the sending or receiving infrastructure — not just TXT records. This check combines email authentication with live MX host IPs, PTR/FCrDNS validation, and DNS blocklist scans so you can see whether your mail servers look trustworthy to receivers.
What you get
- Overall deliverability verdict with prioritized issues list
- SPF and DMARC summary linked to full email authentication details
- Per-MX table: IP addresses, reverse DNS, FCrDNS pass/fail, blocklist status
- Warnings for missing PTR, failed forward-confirmed reverse DNS, or listed mail IPs
- Permalink and Recheck for monitoring after DNS or delisting changes
How to use
Enter the domain that sends or receives mail (example.com). For SPF/DKIM/DMARC-only details, use Email Authentication; for advanced MTA-STS/TLS-RPT, see that page after a domain check.
FAQ
How to check if my mail server IP is blacklisted?
Enter your domain — the tool resolves MX hosts to IPs and scans each address against spam and abuse DNS blocklists with a clear listed-or-clean verdict.
Why is email going to spam after SPF and DMARC are correct?
Receivers also score MX IP reputation, reverse DNS, and forward-confirmed PTR. Mail Server Health combines auth records with PTR/FCrDNS and blocklist status per MX IP.
What is forward-confirmed reverse DNS (FCrDNS) for mail?
The MX IP should have a PTR hostname that resolves back to the same IP. Missing or mismatched FCrDNS is a common deliverability warning on receiving servers.
How to test mail deliverability without sending an email?
Use Mail Server Health for MX IPs, PTR, blocklists, and SPF/DMARC summary in one report — no test message or mailbox required.
How is Mail Server Health different from Email Authentication?
Email Authentication focuses on SPF, DMARC, and DKIM TXT records. Mail Server Health adds live MX infrastructure checks: IP blacklists and reverse DNS for each mail server.
By using this tool you agree to our Terms of Use and Privacy Policy. Results are provided as-is without warranty.