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[OT] Sendmail: Open relay was tested as closed but...
In fact using submission on port 587 with STARTTLS is the right thing instead of the obsoleted SMTPS on port 465.
sendmail  tls  ssl  smtp 
yesterday by dusko
Mail authentication error?
Port 587 isn't an "SSL" port. It's the MSA port, and probably supports
TLS. If Outlook is configured to do SSL rather than TLS, it's not going
to work.

Port 465 is the SMTP "SSL" port.
sendmail  mta  ssl  tls  smtp 
yesterday by dusko

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