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/
