What you are doing is actually just sending them all through your uni account using a different reply to address.
In case of authentication, you will find most isps only dont use user/pass auth because they instead restrict via ip ranges, when using 3rd party smtp you will need authentication.
I just sent my self an email from my ntl smtp server, I tried to change the email address in the account otions in outlook but it got rejected by the smtp server, so I then just changed the from field which I have been trying to explain throughout this thread and it worked. Here is the headers.
Return-path: <realuser@ntlworld.com>
Envelope-to:
chrysalis@chrysalisnet.org
Delivery-date: Fri, 29 Apr 2005 20:19:15 +0000
Received: from mail by web1.hostingfreak.net with spam-scanned (Exim 4.50)
id 1DRbx2-000Ozg-Kj
for
chrysalis@chrysalisnet.org; Fri, 29 Apr 2005 20:19:15 +0000
Received: from smtpout17.mailhost.ntl.com ([212.250.162.17] helo=mta09-winn.mailhost.ntl.com)
by web1.hostingfreak.net with esmtp (Exim 4.50)
id 1DRbx2-000Ozd-Hj
for
chrysalis@chrysalisnet.org; Fri, 29 Apr 2005 20:19:04 +0000
Received: from aamta06-winn.mailhost.ntl.com ([212.250.162.8])
by mta09-winn.mailhost.ntl.com with ESMTP
id <20050429201859.JHQA28254.mta09-winn.mailhost.ntl.com@aamta06-winn.mailhost.ntl.com>
for <chrysalis@chrysalisnet.org>; Fri, 29 Apr 2005 21:18:59 +0100
Received: from homeamd2200 ([82.21.26.x])
by aamta06-winn.mailhost.ntl.com with ESMTP
id <20050429201859.SILX5678.aamta06-winn.mailhost.ntl.com@homeamd2200>
for <chrysalis@chrysalisnet.org>; Fri, 29 Apr 2005 21:18:59 +0100
From: <spoofed@ntlworld.com>
Sender: "Chris" <realaddress@ntlworld.com>
To: <chrysalis@chrysalisnet.org>
Subject: 111
Date: Fri, 29 Apr 2005 21:27:49 +0100
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_001D_01C54D02.4C47E2A0"
X-Mailer: Microsoft Office Outlook, Build 11.0.6353
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527
Thread-Index: AcVM+ebrZwsJkCIXSEu1/sTiHn2f2Q==
X-MS-TNEF-Correlator: 0000000074FC67B5865BC244AE0A93B4F54BA94224EC2200
Message-Id: <20050429201859.SILX5678.aamta06-winn.mailhost.ntl.com@homeamd2200>
X-Antivirus-Scanner: Scanned with Exiscan. You should still use an antivirus.
X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on
web1.hostingfreak.net
X-Spam-Level:
X-Spam-Status: No, score=0.2 required=5.0 tests=NO_REAL_NAME autolearn=no
version=3.0.2
Try sending me an email from your ntl account and spoof it, I will reply to your actual ntl account.