My Checkout Email From Auctiva to Comcast is being bounced because of there setting not being right.
SMTP error from remote mail server after MAIL FROM:<drbob2@taconic.net>
> SIZE=2563:
> host gateway-r.comcast.net [216.148.227.126]:
> 521-EHLO/HELO from sender 38.102.38.5 does not map to mail.auctiva.com
> in DNS
> 521-sending machine name must be provided as a fully
> 521-qualified domain via EHLO/HELO command.
> 521-see section 4.1.1.1 and 4.1.4 of RFC 2821
> 521 521: Comcast requires that all mail servers must have a PTR record
> with a valid Reverse DNS entry. Currently your mailserver does not fill
> that requirement. For more information, refer to:
> http://www.comcast.net/help/faq/index.jsp?faq=Email118405
Why??

this issue is associated with a problem auctiva is having with one of their mail servers. They have been told by the representives at their colocation that they are working on having it resolved...so hopefully it won't be too much longer.

besically it's auctiva's webspace provider's screwup and auctiva is trying to get them to fix it.