Problems with Exim and Outlook 2K3(delayed)..possibly relating to DNS? w/ cPanel srvr

Hello all,

The problem is... Exim is becoming slower for some reason. For example, when someone sends email to me... in Horde I can see it perfectly fine in a few seconds! But it Outlook 2K3 it dosent see the "new mail" and later on (probably a week) the email will show BEING DELIVERED ON THE SAME DATE. I just noticed that today. Also, for some reason exim can't route to some domain's such as comcast.net... here is my error log from the email:

Return-path: <>
Envelope-to: nobody@myserver
Delivery-date: Wed, 24 Nov 2004 21:04:44 -0500
Received: from mailnull by myserver with local (Exim 4.43)
id 1CX900-0006df-NX
for nobody@myserver; Wed, 24 Nov 2004 21:04:44 -0500
X-Failed-Recipients: al3x_isonfire@comcast.net
Auto-Submitted: auto-generated
From: Mail Delivery System <Mailer-Daemon@myserver>
To: nobody@myserver
Subject: Mail delivery failed: returning message to sender
Message-Id: <E1CX900-0006df-NX@myserver>
Date: Wed, 24 Nov 2004 21:04:44 -0500


This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

person@comcast.net
unrouteable mail domain "comcast.net"

------ This is a copy of the message, including all the headers. ------

Return-path: <nobody@myserver>
Received: from nobody by myserver with local (Exim 4.43)
id 1CX900-0006dd-M0
for al3x_isonfire@comcast.net; Wed, 24 Nov 2004 21:04:44 -0500
To: al3x_isonfire@comcast.net
Subject: New Private Message has arrived
Reply-to: nec@myserver.com
From: nec@myserver.com
Message-ID: <689389b9af3a7a5223374383b016147b@Myserver.com>
MIME-Version: 1.0
Content-type: text/plain; charset=iso-8859-1
Content-transfer-encoding: 8bit
Date: Wed, 24 Nov 2004 21:04:44 -0500
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: PHP
X-MimeOLE: Produced By phpBB2

and tail -10 from exim logs:

root@ndo [/home/rapid/cs1.6/hlds_l/cstrike]# tail -10 /var/log/exim_mainlog
2004-11-24 21:04:44 1CX900-0006dd-M0 <= nobody@myserver U=nobody P=local S=985 id=689389b9af3a7a5223374383b016147b@Mydomain.com
2004-11-24 21:04:44 1CX900-0006dd-M0 failed to expand condition "${perl{checkspam}}" for lookuphost router: you are not permitted to relay mail at /etc/exim.pl line 490.

tail -10 /var/log/exim_mainlog
2004-11-24 21:04:44 1CX900-0006dd-M0 failed to expand condition "${perl{checkspam}}" for literal router: you are not permitted to relay mail at /etc/exim.pl line 490.

2004-11-24 21:04:44 1CX900-0006dd-M0 ** al3x_isonfire@comcast.net R=fail_remote_domains: unrouteable mail domain "comcast.net"
2004-11-24 21:04:44 1CX900-0006df-NX <= <> R=1CX900-0006dd-M0 U=mailnull P=local S=1853
2004-11-24 21:04:44 1CX900-0006dd-M0 Completed
2004-11-24 21:04:44 1CX900-0006df-NX => nec <nobody@myserver> R=virtual_user T=virtual_userdelivery
2004-11-24 21:04:44 1CX900-0006df-NX Completed
2004-11-24 21:07:14 1CX92Q-0006hY-6E <= nobody@devshed-d2.candidhosting.com H=(devshed-d2.candidhosting.com) [66.230.239.164] P=esmtps X=TLSv1:AES256-SHA:256 S=1082 id=200411250203.c8d354371558@forums.devshed.com
2004-11-24 21:07:14 1CX92Q-0006hY-6E => nec <nec@mydomain.com> R=virtual_user T=virtual_userdelivery
2004-11-24 21:07:14 1CX92Q-0006hY-6E Completed

What do these mean... and what kind of error am I looking at? DNS or Exim itself?

I'm using cPanel and there are many /scripts/ exim things that I can use, but am unsure what they're functions are.... if you have experience with cPanel and exim please post!