Administrace komentářů

Jako ze spammer posle na adresu nesmysl@server.vosvdf.cz nejakej spamovej email, muj server ho prijme a namisto normalniho informacniho emailu od postfixu ze adresat neexistuje to zpetne odesle nejakej spam? Vim ze odchozi adresa neni nijak kontrolovana, takze tam spammer da jako odchozi adresu vlastne cileneho prijemce toho spamu?

Jak lze tohle zablokovat?

Mam tam spamassassina, ale uprimne jsem ho moc nepochopil, takze jsem to nastavil podle navodu a minimalne na prijem to funguje.

/etc/postfix/master.cf:

smtp    unix    -       -       n       -       -       smtp
  -o content_filter=spamchk

spamchk   unix  -       n       n       -       10      pipe
   flags=Rq user=filter argv=/usr/local/bin/spamchk -f ${sender} -- ${recipient}

/usr/local/bin/spamchk:

#!/bin/sh

 # -----------------------------------------------------------------
 # File:        spamchk
 #
 # Purpose:     SPAMASSASIN shell-based filter
 #
 # Location:    /usr/local/bin
 #
 # Usage:       Call this script from master.cf (Postfix)
 #
 # Certified:   GENTOO Linux, Spamassassin 3.0, Postfix
 # -----------------------------------------------------------------

 # Variables
# SENDMAIL="/usr/local/postfix/sendmail/sendmail -i"

 SENDMAIL=" /usr/sbin/sendmail.postfix -i"
 EGREP=/bin/egrep

 # Exit codes from <sysexits.h
 EX_UNAVAILABLE=69

 # Number of *'s in X-Spam-level header needed to sideline message:
 # (Eg. Score of 5.5 = "*****" )
 SPAMLIMIT=5

 # Clean up when done or when aborting.
 trap "rm -f /var/tempfs/out.$$" 0 1 2 3 15

 # Pipe message to spamc
# cat | /usr/bin/spamc -d 192.168.3.200 -u filter > /var/tempfs/out.$$
 cat | /usr/bin/spamassassin > /var/tempfs/out.$$

# Are there more than $SPAMLIMIT stars in X-Spam-Level header? :
 if $EGREP -q "^X-Spam-Level: \*{$SPAMLIMIT,}" < /var/tempfs/out.$$
 then

#mezi 5 a 8 posli ke me, nad 8 smaz nadobro
 if $EGREP -q "^X-Spam-Level: \*{8,}" < /var/tempfs/out.$$
 then
  rm -f /var/tempfs/out.$$
 else
   $SENDMAIL stepanek@vosvdf.cz < /var/tempfs/out.$$
  fi


 else
   $SENDMAIL "$@" < /var/tempfs/out.$$
 fi

 # Postfix returns the exit status of the Postfix sendmail command.
 exit $?

Zdenek