If you run a mail server you are obligated to have a working postmaster account
@sir it’s tradition
@sir my sysadmin does
@sir i am lazy, just use wildcard for my domains
but don't run a mailserver. doing it right is not easy
@sir If your land contains a pond with waterfowl you must maintain a duckmaster account
@sir I usually collect all root, admin, administrator, webmaster, postmaster mail into one account and all non-user mail into another which is good for an instructed spamfilter on one hand and on the other for me to see what the internet is trying to do with my server.
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