Chris Mason wrote:

I have setup some new lists on a new server and the lists seem to work fine, users get the mail, all is well. However, after every post to the lists, I get loads of messages from mailman-bounces@mylistserver.com to the mylist-admin@mylistserver.com

I assume that's a typo; they should be addressed to mylist-owner@mylistserver.com.

with the subject "Uncaught bounce notification", and there is an attachment. However, the attachment, named ForwardedMessage.eml, is always blank, not even a subject, no headers, nothing. I have no idea what is causing this. Any suggestions?

I think your MUA (mail reader) is not showing you what's there. The unrecognized bounce notice from Mailman does have the notice attached as a message/rfc822 part, but the name ForwardedMessage.eml is made up by your MUA; it is not in the notice.

If you can, look at the raw source of these messages, and see what you see.

Since the messages come after posts are sent, they are almost certainly responses to the posts. There has to be at least a Received: header in the message delivered to the mylist-bounces address.

What's in the body of the notification message? It should be

The attached message was received as a bounce, but either the bounce format was not recognized, or no member addresses could be extracted from it. This mailing list has been configured to send all unrecognized bounce messages to the list administrator(s).

For more information see: http://www.example.com/mailman/admin/LIST_NAME/bounce

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