Replying to @pwaring
Assuming Debian, delete everything in /etc/exim4 and say β€œMartin, can I have your minimum useful exim4.conf, please?”
The problem with exim4 and Debian is that the magic configuration tool produces insanely complicated config files even for the simplest setups.
I generally use the debian exim config for basic mid-flow machines (i.e. not internet facing ones) and we have custom exim config for our incoming mail servers and mail backends; and our outgoing server is postfix, though I am not sure why @rjek picked that.

Jul 20, 2020 Β· 11:06 AM UTC

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Aah yes, exim's default approach of "woah that's a lot of mail, Imma wait a bit and see before I send it all out"
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