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+ - Yahoo DMARC implementation breaks most mailing lists

Submitted by pdclarry
pdclarry (175918) writes "On April 8 Yahoo implemented a new DMARC policy that essentially bars any Yahoo user from accessing mailing lists hosted anywhere except on Yahoo and Google. While Yahoo is the initiator, it also affects Comcast, ATT, Rogers, SBGlobal and several other ISPs. Internet Engineering Council expert John R. Levine, specialing in email infrastructure and spam filtering claimed in a post “Yahoo breaks every mailing list in the world including the IETF's.” on the Internet Engineering Task Force (IETF) list.

DMARC (Domain-based Message Authentication, Reporting & Conformance) is a two year old proposed standard previously discussed on Slashdot that is intended to curb email abuse, including spoofing an phishing. Unfortunately, as implemented by Yahoo, it claims most mailing list users as collateral damage. Messages posted to mailing lists (including listserv, mailman, majordomo, etc) by Yahoo subscribers are blocked when the list forwards them to other Yahoo (and other participating ISP's) subscribers. List members not using Yahoo or its partners are not affected and will receive posts from Yahoo users. And posts from non-Yahoo users are delivered to Yahoo members. So essentially those suffering the most are Yahoo's (comcast's, att's, etc) own customers. Hacker News has details about why DMARC has this affect on mailing lists. Their best proposed solution is to ban Yahoo email users from mailing lists and encourage them to switch to other ISPs. Unfortunately, it isn't just Yahoo, although they are getting the most attention."
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Yahoo DMARC implementation breaks most mailing lists

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