On 8/24/2012 8:55 AM, David F. Skoll wrote:
On Fri, 24 Aug 2012 16:29:18 +0100
Ned Slider <n...@unixmail.co.uk> wrote:
If Microsoft want to examine the From header then that is their
concern. Googling shows others tend to agree with you that their
implementation is broken, or in your words wrong. It is certainly
wrong in SPF terms, but again it's not SPF :-)
The problem is that I publish SPF records for my domain in the expectation
that they'll be used correctly. By behaving incorrectly, Microsoft
is making it less attractive for sites to publish SPF records lest they
be misinterpreted.
The behaviour is "correct" due to the fact that Exchange implemented
Sender-ID rather than SPF; Sender-ID's repurposes SPF v1 records when no
SPF 2.0 record exists.
Add yourself a "spf2.0/pra ?all" TXT record and this behaviour will cease.
While I'd argue that this specification is broken by design, it is at
least a published specification and therefore one can work around it in
a reliable fashion.
--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren
