Dear Listmember,

I use http://www.courier-mta.org/reformail.html for

"Detecting duplicate messages"

### The -D option implements a simple way to delete duplicate messages in incoming mail. filename is a file that will be approximately 'len' bytes long. This file will be used by reformail to save message IDs seen in recent mail. reformail reads the message on standard input. If the message has a Message-ID: header that's already in the cache file, reformail terminates with the exit code set to 0. Otherwise, reformail terminates with the exit code set to 1. ###

### my entry in mailfilter reformail -D 8192 $HOME/.msg.cache if ($RETURNCODE == 0) { /^From: *!.*/ FROM1=${MATCH2}

/^Subject: *!.*/

log "$FROM (${FROM1}) => Not Delivered duplicate MSG-ID. Subject ${MATCH2}\n" exit } ###

Is there a similar feature in sieve or can I still use the upper setup?

Another question is about to add this header line in every mail.

xfilter "${REFORMAIL} -a\"Lines: $LINES\""

Thanks for your help.

BR Aleks