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SMTP-CONNECT-FAILED

Could not connect to the mail server on port 25

What it means

If our probe cannot reach port 25, most senders cannot either; mail queues and bounces.

How to fix it

  1. 1Check the mail service is running and listening on port 25.
  2. 2Check firewall and cloud security-group rules allow inbound 25 from the internet.

Re-check after the change

DNS changes can take up to the record's TTL to be seen; use Re-run on the result page to bypass our 10-minute cache.