Yeah, Yahoo just basically broke the Internet,
http://www
itworld
com/security/413581/yahoo-email-anti-spoofing-policy-breaks-mailing-lists
http://www
ietf
org/mail-archive/web/ietf/current/msg87153
html
Hopefully, they'll figure out how foolish they are
You may want to think about using, "p p mode" in Bridge - came out around v6 8 It was initially put in, so that you could run a mailing list with Amazon SES - you need to authenticate all mail senders w/SES, which is unrealistic for a discussion mailing list
It may work in your case as well, since your member's yahoo addresses won't be in the From: header at all, so the DMARC stuff shouldn't be triggered
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