15May/090
Filtering Postini tagged mail with Sieve
The headers Postini's anti-spam system adds to emails are quite hard to filter on, as you need to compare part of one header to part of another. Here's a little snipped that works with dovecot 1.2's sieve implementation. I don't actually use this myself anymore, but I'm posting it here for anyone else struggling with the problem.
if not header :matches "X-pstn-addresses" "good)"
{
# X-pstn-levels: (S: 0.00799/98.42547 CV:99.9000 FC:95.5390 LC:95.5390 R:95.9108 P:95.9108 M:97.0282 C:98.6951 )
# X-pstn-settings: 3 (1.0000:1.0000) s cv gt3 gt2 gt1 r p m c
if header :matches "X-pstn-levels" "(S: *.*/*"
{
set "score" "${1}";
set "scoredp" "${2}";
if header :matches "X-pstn-settings" "? (*:*.*) *"
{
set "threshold" "${3}";
set "thresholddp" "${4}";
if string :value "lt" "${score}" "${threshold}"
{
fileinto "postini";
stop;
}
}
}
}
As a quick note, my final solution was to add a much simpler header after using exim's perl integration to parse the postini headers.