SMTP Tester — Free SMTP Test Tool & Online SMTP Test
SMTP Tester is a free SMTP test, SMTP server test tool, and SMTP connection tester.
Run an SMTP test online to test your mail server online, check SMTP server settings,
test outbound SMTP server connectivity, or run an SMTP relay test online. Use it as an
SMTP authentication checker, SMTP TLS test, SMTP handshake tester, SMTP debugging tool,
or SMTP command tester — with SMTP test port 587, SMTP test port 465, or test SMTP port 25.
Live protocol transcript; credentials are not stored on the server.
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