There are STILL a number of mailers out there that use the RFC822 "To:"
info to decide where to deliver the messages. So here is what happens:
1. Joe posts to list.
2. LISTSERV forwards to moderator.
3. Moderator approves and forwards back to list.
4. LISTSERV distributes happily.
5. Broken mailer gets message, sees "To:" line, and delivers back to
list.
6. LISTSERV forwards to moderator.
It can be difficult to identify the failing addresses, but at any rate
the message should not be distributed a second time.
Eric