Recently switched to another ISP. Updated the MX record with the web hoster accordingly. Now, emails to comcast addresses (in particular), result in the following:
[recepient]@comcast.net on Sun, 17 Sep 2006 21:59:47 -0700
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<acsportland.com #5.5.0 smtp;521-EHLO/HELO from sender 22.214.171.124 does not map to acsportland.com in DNS>I'
I've looked at some related articles on google, but none seem to give me step-by-step (detailed) instructions on how to get it resolved. If anyone has any suggestions here, I would appreciate it. Thanks.