Mac mail sending delivery fail message for every email
Just starting last week my mac mail has started sending delivery failure messages for every email. Both emails I send and emails from others sent to me. Every time. The subject is always "Internet & Whatever the name of the sender is". They are from postmaster@mac.com. I've created rules to send anything from that address to trash but they keep coming into my mail anyway.Is there a way to stop this? Thanks for any help.
MacBook Pro