Educause Security Discussion mailing list archives
DMARC, Yahoo and mailing lists
From: Andrew Daviel <advax () TRIUMF CA>
Date: Wed, 18 Jun 2014 17:11:07 -0700
Has anyone had problems with Yahoo email users and mailing lists since April, and if so what did you do about it ?
http://blog.threadable.com/how-threadable-solved-the-dmarc-problem Apparently there's a patch available for mailman, but I haven't tried it yet.I hadn't been made aware of any mailing list problems here, but now I start looking into it with some test accounts, it seems I cannot send a message via mailman from a yahoo account to another yahoo account, or from a yahoo account to a hotmail account. Not just being filtered as spam, but actually getting an SMTP rejection.
When I check, I see that at least the following now have "reject" DMARC records:
facebook.com linkedin.com paypal.com yahoo.com twitter.com viz. DNS TXT records for xxx.tld, e.g. "host -t txt _dmarc.yahoo.com" or "dig +short -t txt _dmarc.twitter.com"This probably has implications for Unix-style mail forwarding, too - forwarded linkedin and facebook notifications may fail if the target domain implements DMARC filtering.
-- Andrew Daviel, TRIUMF, Canada Tel. +1 (604) 222-7376 (Pacific Time)
Current thread:
- DMARC, Yahoo and mailing lists Andrew Daviel (Jun 18)
- Re: DMARC, Yahoo and mailing lists Roger A Safian (Jun 19)
- Re: DMARC, Yahoo and mailing lists Walter Moore (Jun 19)