My guess would be that most don't take the time to register. We didn't. We mainly have added SPF records for domains that do not send mail at all, thus cutting down on potential forging spam, and domains that we can be sure will only send from our MXs. It's too much of a pain to try to gather all MXs for a large ISP, and mostly useless since a large user base also means there's a good chance spammers or zombies are also on ISPs network...and would therefore pass SPF. I'd rather give an unknown result than a pass result in those cases.
Darin. ----- Original Message ----- From: "Glenn Smith" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 09, 2004 9:44 AM Subject: Re: [IMail Forum] SPF Impacts to ISPs Are many people picking this up and implementing it? According to the web site they've only got ~6000 registrations, which is not exactly a lot when you consider the size of the internet. G. ---------- Original Message ---------------------------------- From: "Darin Cox" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] Date: Mon, 9 Aug 2004 09:35:23 -0400 >You are correct. SPF is mostly useless in that scenario unless you can also >list all MXs for ISPs that may be used to send from. There is a weaker SPF >syntax for when you allow mail to come from other unknown servers, but in my >mind there's not much point in implementing it other than to say you're >using SPF. > >Darin. > > >----- Original Message ----- >From: "Glenn Smith" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Monday, August 09, 2004 9:24 AM >Subject: [IMail Forum] SPF Impacts to ISPs > > >Hi All, > >Someone's just pointed me to http://spf.pobox.com/ which looks like there >could be a whole load of impacts to ISPs. > >Has anyone really looked in to this and found anything useful out? From our >perspective, we only send email out from our server for our domains, so not >a huge issue to add them, although a real pain. > >But if you think about someone offering dialup, and they have users sending >email with the from address as a personally registered domain rather than >the ISPs through the ISP mail server it would stop working. > >Thanks, > >Glenn Smith > > >To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html >List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ >Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > >To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html >List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ >Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
