SMTP Connectivity Test
Test whether public MX servers answer safely on TCP port 25.
What DomainPulse checks
Public IP resolution, TCP connection, banner, EHLO capabilities and latency without sending DATA.
Common problems
Connection timeout, refused service, invalid banner and incomplete EHLO negotiation.
FAQ
Does the test send email?
No. It stops after transport and TLS diagnostics.
Are private IPs tested?
No. Private, reserved, link-local and metadata destinations are blocked.