You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 7 Next »

Filter mails in Outlook Express

If SpamAssassin only adds some mail headers (like X-Spam-Flag) to tag spam and you don't want the subject to be mangled, Outlook Express cannot filter spam to a separate folder. A [http://article.gmane.org/gmane.mail.spam.spamassassin.general/52651 nice idea] from a person called Matt was to change the mail's priority to low, because this is something that OE can use for filtering. This can be done using [http://www.procmail.org/ procmail], as scripted by DanKohn or using [http://www.courier-mta.org/maildrop/ maildrop] as scripted by Kai Bolay.

This procmail version has been updated to first remove low priority headers from messages before filtering:

# Remove low priority headers by piping through formail.
# If end-users filter on low priority headers, this will avoid
# false positives.  This is a procmail "or" rule requiring any
# of the three headers to trigger.

:0fw: formail1.lock
* ^X-Priority: 5|\
  ^Priority: Non-Urgent|\
  ^Importance: low
| formail -I "X-Priority" -I "Priority" -I "Importance"

:0fw: spamassassin.lock
* < 256000
| spamassassin

# Pipe likely spam through formail adding
# the three headers that represent low priority

:0fw: formail2.lock
* ^X-Spam-Flag: YES
| formail -I "X-Priority: 5" -I "Priority: Non-Urgent" -I "Importance: low"

The same with maildrop:

if ($SIZE < 256000)
{
   exception {
     xfilter "spamassassin"
   }
}

if (/^X-Spam-Flag: YES$/)
{
   # add the three headers that represent low priority
   exception {
     xfilter 'reformail -I "X-Priority: 5" \
                        -I "Priority: Non-Urgent"
                        -I "Importance: low"'
   }
}
else
{
   if (/^X-Priority: 5$/ || \
       /^Priority: Non-Urgent$/ || \
       /^Importance: low$/)
   {
     # Remove low priority headers by piping through reformail.
     # If end-users filter on low priority headers, this will avoid
     # false positives.
     exception {
       xfilter 'reformail -I "X-Priority:" \
                          -I "Priority:" \
                          -I "Importance:"'
   }
}
  • No labels