On Fri, 24 Aug 2012 19:01:34 +0100 Ned Slider <n...@unixmail.co.uk> wrote:
> I don't think it diminishes the effectiveness of SPF though. Here's the problem: One of our services sends email with an envelope address of <> and a From: header address within roaringpenguin.com. In this case, an SPF implementation may use the HELO hostname as the SPF domain. However, MSFT is using roaringpenguin.com and deciding that our message is failing SPF and rejecting it. We're in a position to say "Get lost, Microsoft" but a lot of people who need to get mail delivered may opt instead to weaken or remove their SPF records. :( Regards, David.
