SPAM-bait takers by using the mailproc.ini keys ProcessDNSBL and ProcessSPAM
  (default: True) respectively.
* sockmimetext() (used for sending message text over SMTP and POP3) now handles
  lines longer than 998 characters correctly (doesn't drop any characters).
  We may need to change this function to split at 510 chars for POP3 and/or use
  quoted-printable content-transfer-encoding for messages with long lines.
* "!SMTP ..." log lines changed to "SMTP ..." for non-terminal SPAM-related log
  entries.
* Handle header "field : value" syntax for subject, from, and to field parsing
   for early filtering.
* Don't tag message (subject and/or header) from DNSBL-listed servers when
   DNSBL_IGNORE option is set.
* Don't hash message subjects < 10 chars in length (too short for SPAM
  detection).
* Support Base64 and Quoted-Printable Content-Transfer-Encodings in SMTP
   message headers (decode and store message body accordingly).
* Clear mailproc 'to' match results when receiving SMTP MAIL FROM command.
* Allow SMTP authenticated clients to feed the SPAM database by sending mail
  to one of the spam-bait addresses (the sender won't be added to
  spamblock.cfg).