On Thu, 7 May 1998, Mike Schmitz wrote: : Does anyone have a procmail recipe to supress duplicate email? (Useful when : subscribed to more than one Debian list).
It's widely spread on the Internet:
## ELIMINATES DUPLICATE MESSAGES WITH SAME MESSAGE ID
:0 Wh: msgid.lock
| $FORMAILZ -D 32768 $PMDIR/cache.msgid
-Remco
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