[Mailman-Developers] where is this bounce message coming from

[Seth Galitzer]

Greetings,

A member of one of many lists I help manage recently got this rejection
message:

The message's content type was not explicitly allowed

I do have content-filtering enabled on this list and have the following
items in the pass_mime_types list:
multipart/mixed
multipart/alternative
text/plain

I do not have any items in the filter_mime_types list,
convert_to_plaintext is set to Yes, and the filter_action is set to
Reject.

I had the user send me a copy of the message he tried to send.  Reading
the source of the message, it contained the following in the
Content-Type header:
multipart/related; type="multipart/alternative";

And then in subsequent mime sections it had parts with the following
Content-Types:
multipart/alternative
text/plain
text/html
image/gif

Now, it is my understanding, that with my current configuration, if any
part has a mime-type that is not listed in the whitelist, that part is
just dropped.  Is that correct?  Since the whole message was typed as
multipart/related, did that cause the filters to behave differently? 
>From the docs: "Note this action is not taken if after filtering the
message still contains content. In that case the message is always
forwarded on to the list membership."  Since there was at least one
text/plain part and since I have also enabled plaintext conversion,
shouldn't the message have gone on to the list anyway?

I guess I'm just confused as to why this one got bounced.  This is the
first time a message has been bounced due to content filtering since we
enabled the feature a month or so ago.

On a related note, if I set the filter_action to Preserver instead of
Reject, will the message go into the pending moderator request queue, or
into a different queue?

Just trying to sort things out.

Seth

-- 
Seth Galitzer			sgsax at ksu.edu
Computing Specialist		http://puma.agron.ksu.edu/~sgsax
Dept. of Plant Pathology
Kansas State University