Having spent this evening trying numerous combinations I’ve managed to install postfix outside the containers that Discourse runs in and can send e-mail via Mailgun that way from the command line, so I have configured postfix to us Mailgun successfully. I’m still drawing a blank trying to get the settings into the mail-receiver container that will make the relaying work via Mailgun. I’m sure there must be a (simple!) way. I can’t seem to find any logs to find out why messages are getting stuck on the mail queue. Containers weren’t around the last time I used linux (a number of years ago). Is there a way of turning on logging so I can see what communication postfix is trying to attempt so I can figure out where the problem is? Conceptually I would like admin@mydomain, once it has come in, to go straight out to my personal gmail account via Mailgun with category1@mydomain and category2@mydomain etc to get pushed on locally to discourse to use to create posts.
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