Mail problems still.....

Hi folks,

I'm having a rather frustrating time of mailing Jon. My regular mail is OK,
I've both sent and recieved mail so it is not a general problem, however, when
I try to mail Jon I get the mail bounced back.

I normally wouldn't do something like this but I'm really peeved at this so
I hoped one of you computer bods may be willing to help/explain why this
is happening (by replying to me privately rather than to the list).

Below is the bounce back mail with error messages:

> Received: from localhost by relay1.UU.NET with internal
        id QQfbla02502; Fri, 7 Aug 1998 14:37:08 -0400 (EDT)
Date: Fri, 7 Aug 1998 14:37:08 -0400 (EDT)
From: uunet!MAILER-DAEMON (Mail Delivery Subsystem)
Subject: Returned mail: Service unavailable
To: <uunet!aecom.yu.edu!smurray>
MIME-Version: 1.0
Auto-Submitted: auto-generated (failure)
Status: RO
X-Status:

The original message was received at Fri, 7 Aug 1998 14:36:37 -0400
(EDT)
from post.aecom.yu.edu [129.98.1.4]

   ----- The following addresses had permanent fatal errors -----
<uunet!gzero.dungeon.com!jon>

   ----- Transcript of session follows -----
553 <uunet!gzero.dungeon.com!jon>... unauthorized relay traffic prohibited 554
<uunet!gzero.dungeon.com!jon>... Service unavailable

Reporting-MTA: dns; relay1.UU.NET
Received-From-MTA: dns; post.aecom.yu.edu
Arrival-Date: Fri, 7 Aug 1998 14:36:37 -0400 (EDT)

Final-Recipient: rfc822; jon@gzero.dungeon.com
Action: failed Status: 5.5.0
Remote-MTA: dns; post.aecom.yu.edu
Last-Attempt-Date: Fri, 7 Aug 1998 14:37:07 -0400 (EDT)

Return-Path: <smurray@aecom.yu.edu>
Received: from post.aecom.yu.edu by relay1.UU.NET with ESMTP (peer
crosschecked as: post.aecom.yu.edu [129.98.1.4])
        id QQfbla02495; Fri, 7 Aug 1998 14:36:37 -0400 (EDT)
Received: from [129.98.70.140] (steelhead.aecom.yu.edu [129.98.70.140])
        by post.aecom.yu.edu (8.9.1/8.9.1) with ESMTP id OAA11031
for <uunet!gzero.dungeon.com!jon>; Fri, 7 Aug 1998 14:36:34
-0400 (EDT)
X-Sender: smurray@mailserver.aecom.yu.edu
Message-Id: <v03110702b1f0f9de496c@[129.98.70.140]>
In-Reply-To: <l03010d01b1ec70ca6ad2@[195.188.107.160]>
References: <v03110700b1ebe1108a26@[129.98.70.140]>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Date: Fri, 7 Aug 1998 14:38:00 -0400
To: Ground Zero Games <uunet!gzero.dungeon.com!jon>
From: Stuart Murray <smurray@aecom.yu.edu>
Subject: Re: Email Problems

> Hi all,

OK, here goes. Let me know if you get this please as the mails I've already
sent have bounced back.