On Sat, 2 Jul 2005, Hector Santos wrote:
How do you handle or what comment do you have about a domain that has no SPF
record, however, the MX host for this domain has a SPF record?
Example:
mail domain:<xxxxxxx @ no-spf-domain.com >
No SPF domain for email domain. But if you do a MX lookup, it has
MX --> mx.host.with-spf.com
and this mx has a SPF record?
The mail domain still doesn't have an SPF record.
I am wondering if there is a consideration or it makes sense to have a
"default MX" SPF lookup for the email domain?
No. The MX hosts are specifically for receiving, not sending mail.
The 'mx' mechanism in SPF is intended for the common case where the same
host is used for both. But it doesn't make sense to make that assumption
in the absence of an SPF record.
If the sending hosts have proper HELO names, you may end up using
the other SPF records for HELO SPF.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.