Here is an example of SPF adversely affecting a legitimate sender who
does not wish to participate (name changed to protect privacy):
$ host -t txt namechanged.org
;; connection timed out; no servers could be reached
Why don't they respond to TXT queries? They get charged by the query
response. Since they don't use TXT queries, why should they pay for
the DNS service to reply "we don't have any"?
But, when they try to send mail to SPF checking domains, the SPF result
is temperror - usually resulting in a 451 rejection.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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