Rainer Bielefeld wrote:

... that sender uses an invalid sender mail address

Hi,

I am afraid it might be some more complicated. I also see such
<dev-apps-seamonkey-bounces+rainerbielefeld_nurng=bielefeldundbuss...@lists.mozilla.org>,
even in the confirmation mail that I am a subscriber for that list. I
will ask mailmanager ....

Best Regards

Rainer Bielefeld

I think any bounce messages from subscriber addresses (e.g. if an address doesn't exist, or mailbox is full, etc.) go to that address, instead of to the original sender. The list manager might just ignore such messages, or some mailing lists I've seen automatically unsubscribe addresses which continually bounce for more than a certain time.

The copy of a message sent to you has the address you mention in its headers. If it couldn't be delivered for some reason, your mail server (or an intermediate server if it didn't even get that far) would send a message to that address describing the problem. The list software can then deal with the problem, without bothering the original sender who probably doesn't want to be bothered with a whole pile of delivery failure messages every time they post to the list.

Mark.

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