When the body of an incoming message has zero length kSpam will crash nSMTP.exe. Only introduced with regex filtering, crashes when trying to match a null pointer.
Example SMTP conversation;
SERVER->220 mail.test.com ESMTP Service (Lotus Domino Release 6.0.1) ready at Fri, 28
Nov 2003 13:03:03 +0000
CLIENT->HELO mail.testing.com
S->250 mail.test.com Hello mail.testing.com ([192.168.2.2]), pleased to meet you
C->MAIL FROM:
S->250 tom@testing.com… Sender OK
C->RCPT TO:
S->250 tom@test.com… Recipient OK
C->DATA
S->354 Enter message, end with "." on a line by itself
C->.