middle.network
Health check

MX lookup, blacklist check and email deliverability tools

When email bounces, goes missing or lands in spam, these tools trace where it goes and how receivers see you.

6
tools
6
live now
6 tools
No tool matches. Try “dns”, “mail” or “ping”, or see every tool.
MX lookup Find the mail servers and check they resolve. Live lookup
SMTP testBeta Connect to a mail server and test STARTTLS. Live lookup
Blacklist check Check an IP or domain against spam blacklists. Live lookup
Bulk sender compliance Check the Gmail, Yahoo and Outlook sender rules. Live lookup
Email header analyser Trace an email’s path and authentication results. Live lookup
DMARC report analyser Read a DMARC aggregate report in plain English. Live lookup

Common questions

Check mail servers, blacklists, bulk-sender rules and email headers to find out why mail bounces or lands in spam.

The usual causes are missing SPF, DKIM or DMARC, a blacklisted sending IP, or no reverse DNS on the mail server. Run the email score to check them all.

Fix the cause first (an infected machine, an open relay, a bad list), then use the delisting form on the blacklist’s own website.