Ecosystem NewsTechnical Guidance

More Yahoo domains move to p=reject

Yahoo is placing ymail.com and rocketmail.com into p=reject on November 2nd. This information is being provided to give people and companies time to prepare, as the #1 piece of feedback from when Yahoo moved yahoo.com to a p=reject was that Yahoo didn't let the Internet know about the move in advance. Hopefully, this announcement will…
dmarcian
12 October 2015
Technical Guidance

Broken SPF…what does it mean?

People sometimes write in and ask "what is the impact of a broken SPF record"? The net effect of a broken SPF record is that receivers can't reliably use SPF to determine the legitimacy of the domain's email.  *Some* receivers might ignore the broken parts of an SPF record and keep checking, but out of…
dmarcian
10 October 2015
Technical Guidance

PTR mechanisms in SPF records

If PTR mechanisms are detected, the current diagnostic output is: Warning: PTR mechanisms SHOULD NOT be used and cannot be resolved using this diagnostic tool. What does the PTR mechanism mean?  When an email receiver gets a piece of email and the PTR mechanism is in the sender's SPF record, the receiver will look at…
dmarcian
9 October 2015