Sendmail and smarthost and authenticated submission on port 587

Today I came across a small and interesting thing. One of our customer have been upgrading from suse to centos, and that also changed the mailer from postfix to sendmail. I consider myself a quite skilled sendmail person but this was a new one.

The system itself is a dumb system and we should forward everyting to a smart host. But we need to do that over port 587 and authenticated.

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