>   Forgive me if this has been asked before.  I've had a few complaints from
> subscribers who have posted messages lately that they are getting both
> "undeliverable mail" bounces and out-of-office auto-reply messages from
> other subscribers when they post to the list--things that I am not seeing
> in my listowner's mailbox, where they should of course wind up instead.
> Why is this happening, and how can I prevent it?


Microsoft Exchange send its Out-Of-Office messages to the address in the
From header -- a poor practice.  LISTSERV never sees them.

Some older non-Internet Mail systems with gateways send bounces to the
From address.