[Mailman-Users] A word to the wise: spam-checking and RFC conformance

Matthew Needham mneedham at hdfgroup.org
Wed May 14 16:09:35 CEST 2014

On my server, it was being instead by spamassassin and was then visible in each message handled by Mailman. The “content-preview” in the header is easily removed in /etc/mail/spamassassin/local.cf.


On May 14, 2014, at 02:52 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:

> Hi all,
> I just discovered that the spam-checker for a non-Mailman list I
> subscribe to (I suspect SpamAssassin but I can't confirm yet, the MLM
> is ListServ) is introducing 8-bit characters into the header.
> What appears to be happening is that the original post uses a
> Content-Transfer-Encoding of 8bit or binary, and contains some 8-bit
> octets (typically fancy quotes and the occasional accented character
> in the posts I receive), and the spam checker copies an excerpt from
> the body into the "X-Spam-Report" field *verbatim*, including the
> non-ASCII characters.
> If your spam-checker doesn't produce an "X-Spam-Report" field or
> similar, you don't have the problem.  If it does, you might want to
> check its behavior with respect to body excerpts.
> Regards,
> Steve
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Matthew Needham
mneedham at hdfgroup.org

The HDF Group
1800 South Oak Street, Suite 203
Champaign, IL 61820

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