I just got done hacking on several Mime messages. I had two problems.
One was that a system was sending error messages about mail to a user they removed. They had been generating error messages for 6 days before I got 188K of Mime messages that I could not read.
Where do errors from Postmaster go?
Is the Errors-to: header ignored?
Do errors go to the From address?
The second problem was from the NEW! AOL mailer. I think my Mime reader was having problems with quoted-printable text. I have received quoted-printable in the past, and may have hit a limit because the message was large. I fixed it by editing it 'by hand'. sigh
AOL is trying to make us list managers happy (thanks!). Perhaps a heads up message before a major change would help?