On Thu, 19 Jul 2001 23:35:05 -0500, Tracey McCartney <[log in to unmask]>
wrote:

>The logs show a "550 Relaying is prohibited" message for each
>recipient.

LISTSERV does not itself send any mail to end recipients.  Instead it sends the
mail to an external (usually local) Mail Server which sends out the mail to the
recipients.  This error message is coming from that external mail server and it
is refusing to accept (and realy onwards) mail from LISTSERV.  This involves
some setting on that external mail server which must be set to allow the (relay)
mail coming from LISTSERV to be accepted and processed.  Nothing in LISTSERV can
control this, it is merely trying to send the mail.