Curtis wrote to me privately, saying that none of the posted solutions
is to his liking, and proposing that he keep a separate logfile for each
user, with $LOGNAME in its basename.
Apparently he's using one logfile for all the users on the system and
setting it in /etc/procmailrc? His post didn't tell us that part. No
wonder he gets so many clashes.
Curtis, yes, separate them by user. But near the end of
/etc/procmailrc, just before procmail moves to the recipient's
LOGFILE=$HOME/.procmaillog # or something similar that suits your system
so that users who don't think of setting LOGFILE themselves won't wonder
where their log entries are going.
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