The procmail rule below solved all my problems with incoming HTML cra^H^H^H mail. It also reduced the amount of spam in my mailbox by more than half.

:0
* ^Content-Type: .*(text/html|multipart/alternative)
{
EXITCODE = 65
:0 fw
| echo "571 No HTML junk here"
:0 r
|
}

(If you use an MTA other than Sendmail, you will probably want to return some other exit code. Check /usr/include/sysexits.h.)

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Link to this comment: http://www.securityfocus.com/comments/columns/58/10570#10570