[Mailman-Users] User's emails being rejected for "content type not explicitly allowed"

Mark Sapiro mark at msapiro.net
Thu Jan 9 06:43:38 CET 2014

On 01/08/2014 09:13 PM, Peter Shute wrote:
> I was looking at the message attached to the user's rejection email, but now that I look at the one attached to the moderator alert email, I can see that there's an html signature that appears to have been treated as a separate attachment of content-type application/unknown. What's the best way to deal with those?

That's not it.

Look at the list's content filtering options. What is happening is that
pass_mime_types is not empty and does not contain the content-type of
the message and filter_action is reject.

This most often happens when the content-type is text/html and that is
not allowed, but it can also happen for example it the message's
content-type is say multipart/related, and pass_mime_types contains
multipart/mixed and multipart/alternative but not multipart and not

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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