Why the Email of @yahoo.com can't subscribe majordomo at vger.kernel.org ?

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Tue Jan 6 13:11:02 EST 2015

On Tue, 06 Jan 2015 23:25:18 +0530, Anand Moon said:

> This mails from yahoo mail server are being dropped by kernel mailing list
> But why such a policy ?

Yahoo and AOL made a rather ill-advised change in their mail configuration, which
causes issues for mailing lists. In self-defense, many lists no longer accept
mail from Yahoo or AOL users.

The gory details:

"With the new policy, when a Yahoo user sends an email to a mailing list, the
list's server distributes that message to all subscribers, changing the
headers and breaking DMARC validation. List subscribers with email accounts on
servers that perform DMARC checks, such as Gmail, Hotmail (Outlook.com),
Comcast or Yahoo itself, will reject the original message and respond back to
the list with automated DMARC error messages.

For example, Gmail will respond with a message that reads: "smtp;550 5.7.1
Unauthenticated email from yahoo.com is not accepted due to domain's DMARC
policy. Please contact administrator of yahoo.com domain if this was a
legitimate mail."

So users of Gmail, Hotmail and other DMARC-enabled providers will not only fail
to receive messages sent to the mailing list by Yahoo users, but will flood the
list with bounce messages, risking to be bounced off the list themselves,
Levine said."


> How to get this working in the future.

Get an account on Hotmail or GMail or pretty much anyplace besides Yahoo or AOL.
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