spf-discuss
[Top] [All Lists]

RE: [spf-discuss] SPF basics commentary

2007-01-29 10:15:33
On Mon, 29 Jan 2007, william(at)elan.net wrote:

Checking PTR allows to verify if the client is authorized to be
doing SMTP connections as far as owner of the ip space sees it.
This is pretty similar to EHLO/HELO check as it checks if an
SMTP client with specified HELO name is authorized to be using
specified ip address. Note that they are not equivalent.

So basically, you're saying that if an ISP is unable/unwilling to
set up rDNS, then you can't send email, even when their AUP
explicitly says you can, because they are the IP owners, and their refusal to
setup rDNS says you are not authorized to send email.

-- 
              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.

-------
Sender Policy Framework: http://www.openspf.org/
Archives at http://archives.listbox.com/spf-discuss/current/
To unsubscribe, change your address, or temporarily deactivate your 
subscription, 
please go to http://v2.listbox.com/member/?list_id=735