mail.log not showing all sent emails
I'm using postfix as my MTA. Yesterday my server sent out a few hundred emails, but a few recipients did not get their messages. I tried to look at my mail.log to find those emails only to discover that only a couple dozen 'sendings' were recorded.
I.E. I know for a fact that my server sent an email to firstname.lastname@example.org, but that sending is not recorded in my mail.log.
Do I have to configure postfix to do something or look in another log?
My Swift configuration was pointing to an external smtp server. I updated the config and everything started to get logged appropriately.