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

Peter Shute pshute at nuw.org.au
Thu Jan 9 06:13:16 CET 2014

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?

Peter Shute

From: Mailman-Users [mailman-users-bounces+pshute=nuw.org.au at python.org] On Behalf Of Peter Shute [pshute at nuw.org.au]
Sent: Thursday, 9 January 2014 3:42 PM
To: mailman-users at python.org
Subject: [Mailman-Users] User's emails being rejected for "content type not explicitly allowed"

I've got one user whose emails always get bounced back with the message "The message's content type was not explicitly allowed'.

There are no attachments or images in the rejected emails that I can see. Where do I start looking to find out what it's objecting to? Note that we've just moved this list to a new list server, so it's likely to be something we've set wrongly on the new server.

There's a dkim-signature header in it. Could that be doing it?

I'm not an admin, so I don't have access to any of the list settings. What settings should I ask the admin for to help diagnose it?

Peter Shute

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