I understand that Yahoo has implemented a DMARC policy that makes third-party servers reject mailing list traffic using Yahoo-based addresses as forged.
Here is an announcement of a "block Yahoo users" policy just implemented by another free software project ( http://lists.roaringpenguin.com/pipermail/remind-fans/2014/003025.html) which seems to sum the issue up briefly but accurately. FYI, we do have a number of Yahoo users on the Slony lists, and their receiving mail from the lists is not a problem. Unfortunately, posting to these lists will cause problems, so I imagine we'll need to do a similar blocking of Yahoo addresses. Yahoo users that have an opinion should send comments directly to me off-list, as, due to the DMARC policy, forwarding of their opinions via the lists probably won't work out :-(. Doubtless we'll have a more definitive declaration soon. (I observe that Jan Wieck has moved his mail to a new domain over this :-) )
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