I don’t know if this is considered OT, but dovecot has support for sieve. I had 
a rule set running under Mac OS X 10.8.5 Server 2.2.5 which I did maintain by 
hand on the server because a while before Mac OS X Server had dropped support 
for Squirrelmail.

Now I wonder if there is a decent way to get sieve running again on macOS 10.12 
Sierra with Server 5.2

G

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