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

if (/^X-Spam-Flag: YES$/)
{
   # add the four headers that represent low priority
   exception {
     xfilter 'reformail -I "X-Priority: 5" \
                        -I "Priority: Non-Urgent"
                        -I "Importance: low" \
                        -I "X-MSMail-Priority: Low"'
   }
}
else
{
   if (/^X-Priority: 5$/ || \
       /^Priority: Non-Urgent$/ || \
       /^Importance: low$/ || \
       /^X-MSMail-Priority: 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:" \
                          -I "X-MSMail-Priority:"'
   }
}