In the past week or so, I seem to be getting great amounts of those "failure notice" type mails you get from a mail server when an email could not be delivered. But they are not answers to any mails I've ever sent. I think they are some kind of spam (which is sometimes confirmed in the middle of all the code and tech-talk, "spam likelihood 99%" or such). But they don't have links to any sales pages, so I don't know how they are supposed to work.
Does anybody else notice a rise in this phenomenon?
Know how it works?
Thanks to commentors. Indeed it seems related to an old email address of mine (maccreator.com) having been used as fake return address on spam. Not long ago I took an old main address off a spam filter service, and I'd forgotten that the other email address was forwarded to that one for filtering.