I use DSPAM 3.x-3.8 for several years, and it work very well for US ASCII mails.
But it seems as its accuracy decrease for mails written in national languages -
and number of these mails continually increase. I think about two factors which
may come into question:

1) different national encodings used for single countries (e.g. in my Czech rep.
there are three major /UTF-8, ISO8859-2, cp1250/ encodings and several other
minor; in other countries situation may be similar).

2) MIME extensions as defined in RFC 1341/1342/1521/1522/maybe-other allows
encode arbitrary 8-bit text as Base64 or Quoted-printable. It seems spammers now
exploits this technique also even for US ASCII written spams, evidently for
reasons that these spams are worse detected.

My question is: cope DSPAM with these pitfalls (e.g. by encoding MIME parts,
then encoding text to common platform (utf-8?), and destination strings are then
taken as source for DSPAM operations)?

Thanks,
Franta Hanzlik

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