I was doing some research about the evolution of the this-is-spam button for a blog article. In the middle of it, I found an old NY Times report about spam from 2003. At the same time, the argument is intensifying over what represents legitimate e-mail, particularly when it ends up being blocked by an antispam filter. Last November, AOL threatened to block e-mail from Gap. Even though Gap said it...
Multiple ESPs are reporting that the volume of Yahoo! FBL reports have slowed to a trickle over the last 24 or so hours. While we don’t know exactly what is going on yet, or if it’s on track for being fixed, there does seem to be a problem. There has been some ongoing maintenance issues with the Yahoo! FBL, where requests for updates and changes weren’t being handled in a timely...
Comcast recently published a statement on DMARC over on their postmaster page. The short version is that Comcast is publishing a DMARC record, but has no current intentions to publish a p=reject policy for Comcast user email. Comcast will be publishing a p=reject for some of their domains that they use exclusively to communicate with customers, like billing notices and security notices. Comcast...
Over at ReturnPath Christine has an excellent non-technical summary of the DMARC+Yahoo situation, along with some solid recommendations for what actions you might take to avoid the operational problems it can cause.
Yesterday Yahoo posted a statement about their new p=reject policy. Based on this statement I don’t expect Yahoo to be rolling back the policy any time soon. It seems it was incredibly effective at stopping spoofed Yahoo mail. On Friday afternoon last week, Yahoo made a simple change to its DMARC policy from “report” to “reject”. In other words, we requested that all other mail services...
I’ve been getting some mail and calls from folks looking for help on resolving the issue of DMARC bouncing. Some of these calls are from ESPs, but others are from SAAS providers who have users that have signed up with yahoo.com addresses and are now dealing with mail from those users bouncing, even when mail is going back too those users. None of the solutions are really great, but here are...
There are a bunch of them and they’re all worth reading. I have more to say about DMARC, both in terms of advice for senders and list managers affected by this, and in terms of the broader implications of this policy decision. But those articles are going to take me a little longer to write. How widespread is the problem? Andrew Barrett publishes numbers, pulled from his employer, related...
Al has some really good advice on how to fix discussion lists to work with the new Yahoo policy. One thing I would add is the suggestion to actually check dmarc records before assuming policy. This will not only mean you’re not having to rewrite things that don’t need to be rewritten, but it will also mean you won’t be caught flat footed if (when?) other free mail providers...
There are a number of different bounces that people are reporting due to Yahoo publishing a DMARC record of p=reject. I decided to put some of those bounces here so confused users could find out what they needed to do. Comcast smtp;550 5.2.0 meQj1n01053u42A0HeQj3v Message rejected due to DMARC. Please see Google smtp;550 5.7.1 Unauthenticated email from yahoo.com is not accepted due to...
DMARC stands for Domain-based Message Authentication, Reporting and Conformance. What DMARC does is allow domain owners to publish policy statements in DNS telling receiver domains what to do with messages that do not authenticate. In addition, DMARC introduces the concept of “domain alignment.” What this means is that the authentication has to be from the same domain (or a sub...
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