Thanks for the answers, here is my .forward file
bash-2.04$ cat .forward
"|/usr/bin/procmail #climbinc"
and my .procmailrc file
bash-2.04$ cat .procmailrc
SENDMAIL=/usr/sbin/sendmail
LOGFILE=$HOME/errors/log.`date +%Y-%m`
VERBOSE=on
#Mail filtering config
:0
* ^From:(_dot_)*asmar(_at_)pathfinder\(_dot_)gr
/dev/null
:0
* ^From:(.*\<)?asmar(_at_)pathfinder\(_dot_)gr
:0
*^From:jcatena(_at_)speedy(_dot_)com(_dot_)ar
/dev/null
# Test if the email's sender is in the blacklisted
:0
* ? formail -x"From" -x"From:" -x"Sender:" \
-x"Reply-To:" -x"Return-Path:" -x"To:" \
| egrep -is -f /home/climbinc/black.lst
/dev/null
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