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Dealing With DMARC

DMARC is an anti-phishing scheme that was repurposed in April to try to deal with the fallout from security breaches at AOL and Yahoo. A side effect of AOL and Yahoo’s actions is that a variety of bad things happen to mail that has ‘From:’ addresses at aol.com or yahoo.com, but wasn’t sent from AOL or Yahoo’s own mail systems. If the mail is phish or spam, that’s good, but when it’s mailing lists or a newspaper’s mail-an-article, it’s no so good.

The mailing list community has been gnashing its teeth for the past month trying to figure out the least bad ways to deal with the problem.

To keep track of all the ways of avoiding or limiting the damage, I’ve made a page on the ASRG wiki. (The ASRG is gone, but the wiki lives on.)

If I’ve missed anything, let me know and I’ll update it.

By John Levine, Author, Consultant & Speaker

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Co-designer of the TCP/IP Protocols & the Architecture of the Internet

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