What kind of programs are out there that would produce non-spam messages with lots of spaces in the subject line?it's a pretty good filter. the trailing string Subject: line is some kind of ID that spammers use to know which contract spammer sent it, I think.
I run the same thing in IMGate with very few false positives. but you can expand that to other characters
" "
"........."
". . . . ."
"---------"
"- - - - -"
"_________"
"_ _ _ _ _"
Also:
Subject: lines should be 7-bit ASCII only, so 8-bit characters, and non-printable binary are illegal. Spammers now insert non-printable binary into
their Subject: lines to bypass "string" filters that are only looking for 7-bit printable strings.
Subject: Get a bigger member today!
becomes:
Subject: Ge?t? a bi??gger me??mber!
... where the "?" are 8-bit binary codes.
Len
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