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

[Peter Shute]

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

Sent from my iPad