DNS & NetworkNew
SMTP Test Tool
Test SMTP connectivity and inspect the server greeting without sending email.
SMTP Test Tool
DNS & NetworkNewTest SMTP connectivity and inspect the server greeting without sending email.
AK
Test SMTP host, TLS mode, authentication, and optionally submit a sample email message.
Test SMTP host, TLS mode, authentication, and optionally submit a sample email message.
CLI equivalent
openssl s_client -connect mail.example.com:25 -starttls smtpChecks run from the app server against public hosts. Private, localhost, and internal network targets are blocked for safety.
Only when Send sample email is enabled. Otherwise it verifies connection, TLS, and authentication without submitting a message.
Some hosting providers block outbound port 25. Use port 587 or 465 when testing submission servers.