Tag: Yahoo

Yahoo problems

I’m seeing scattered reports today that a lot of places are seeing backed up queues to Yahoo. They’ve had some problems over the last few days and seem to be still recovering. It’s looking like it’s something internal to Yahoo. One set of error messages I’ve seen reported by numerous people is: “451 4.3.2 Internal […]

5 Comments on FCC wireless “do not mail” list

Update: As of mid-morning pacific time on 10/7 has been removed from the FCC list. As part of CAN SPAM the FCC maintains a list of wireless domains that require proof of permission to send mail to. Recently, various email folks noticed that was added to this list. According to the law, senders […]

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Fun with new mailservers

I’m building a new set of mailservers for – our existing mailserver was “I’ll repurpose this test box for a week” about four years ago, so it’s long past time. I tested our new smarthost by sending a test mail to gmail. This is the very first email this IP address has sent in […]


June 2014: The month in email

Each month, we like to focus on a core email feature or function and present an overview for people looking to learn more. This month, we addressed authentication with SPF. We also talked about feedback mechanisms, and the importance for senders to participate in FBL processes. In our ongoing discussions about spam filters, we took […]

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Spammers react to Y! DMARC policy

It’s probably only a surprise to people who think DMARC is the silver bullet to fixing email problems, but the spammers who were so abusing have moved on… to In the rush to deploy their DMARC policy, apparently Yahoo forgot they have hundreds of other domains. Domains that are currently not publishing a […]

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The more things change

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 […]

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Yahoo FBL problems

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 […]


DMARC and organizations

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 […]


ReturnPath on DMARC+Yahoo

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.

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Yahoo Statement on DMARC policy

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 […]

  • Lost in the mists of time

    Over on the Farsight Security blog Joe St. Sauver talks about some of the early days of online abuse, on usenet. Laura and I were on the periphery of early usenet abuse, mostly as users, but Usenet (and IRC) around then were the places we both started with email abuse.No Comments

  • Ongoing Yahoo delays

    I've been hearing from folks over the last few days that they're seeing an uptick in deferrals from Yahoo! The deferrals are not uniform. ESPs report they're seeing some, but not all, customers affected. Other ESPs aren't seeing any changes. It's not just you. But it would be very worthwhile to dig into engagement and other stats. It's possible this is a new normal at Yahoo! and they're tightening filters to catch mail that doesn't fit their standards but was previously difficult to filter.No Comments

  • AOL starts using Sender Score Certification

    Good news for Sender Score Certified IPs. Return Path recently announced that AOL has joined the list of ISPs offering preferential treatment to certified IPs.  1 Comment