On 2015-07-15 13:53, David Jones wrote:
I have seen Microsoft Exchange servers use the header From: domain instead of the envelope-from but this does not follow RFC 4408 spec.
This is valid under Sender-ID, which was Microsoft's attempt at SPF version 2. It has since died a (deserved) death, and such use should be depreciated. However, if you don't have an explicit spf2.0/pra record, Sender-ID suggested using the v=spf1 record instead (which obviously causes issues)
If you want to avoid these tests, add this as a TXT record: "spf2.0/pra" or "spf2.0/pra ?all"
Note that while it was presented as a "version 2", it's depreciated, and "v=spf1" records are still current and the only records that really should be used in practice today.
-- Dave Warren http://www.hireahit.com/ http://ca.linkedin.com/in/davejwarren
