To send email at work I have to go through an exchange server. It
requires authentication to send emails externally, but doesn't require
it when sending internally. My current configuration for postfix
doesn't enforce successful authentication it seems, so if I change my
system (ActiveDirectory) password and forget to update my password map
for postfix then the result is that internal emails are sent fine and
external emails result in a mail-undeliverable message. It would be
better if postfix would hold on to the emails if authentication fails.
Is it possible to configure postfix in that way?