In `/etc/pmg/domains`, a '1' is added to the end of the line. However, this is not referenced anywhere in the Postfix docs regarding `relay_domains`. What does this '1' mean?
After a little research I found out that it is just a must for postmap, this is because it is set as a hashmap and according to the postmap docs (and standards) you need to have a key and a value. It doesn't necessarily have to be an important value, as long as it exists.
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