SMTP Connectivity Test
Verify that your mail servers accept SMTP connections.
No email is sent during this public test.
What this test checks
TCP connection, 220 banner, EHLO capabilities and response latency. DomainPulse stops before DATA.
Why this matters
A published MX host that cannot accept a connection can delay or prevent delivery.
How to fix common problems
Expose a reachable SMTP service on each advertised mail host and investigate timeouts or refusals.
FAQ
Does it relay a message?
No. Public tests never send DATA or probe recipient inboxes.