At 14:44 01/26/2001 Friday, Steve Price wrote:

 >Well I'm not quite convinced of this but I'll definitely hang on
 >to this bit of advice just in case the lead I'm on now doesn't pan
 >out.  It seems *listserv* is setting the Errors-To in the original
 >message to the list and the mailserver is just doing what it is
 >told to do.  Either that or the user's mailer is doing it.  Here
 >are the appropriate parts of the mail header.  NOTE: the names
 >have been changed to protect the guilty^Winnocent.
 >
 >>>Errors-To: <[log in to unmask]>
 >>>Date:         Thu, 25 Jan 2001 05:27:42 -0500
 >>>Reply-To: [log in to unmask]
 >>>Sender: [log in to unmask]
 >>>From: John Q. Public <[log in to unmask]>
 >>>Subject:      Some subject line
 >>>To: [log in to unmask]

LISTSERV(R) doesn't set ERRORS-TO: (an RFC822 field, not an RFC821
field).   All of the fields above are RFC822 fields and mail bouncing is
NOT supposed to use them, just the RFC821 MAIL FROM: field. Many mail
clients do not display RFC821 fields.

Unfortunately broken clients and servers do exist.

/Pete