sqllogictest
Help: test-smtp-probe
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The "test-smtp-probe" command:

Usage: fossil test-smtp-probe DOMAIN [ME]

Interact with the SMTP server for DOMAIN by setting up a connection
and then immediately shutting it back down.  Log all interaction
on the console.  Use ME as the domain name of the sender.

Options:

   --direct              Use DOMAIN directly without going through MX
   --port N              Talk on TCP port N