There are a number of different bounces that people are reporting due to Yahoo publishing a DMARC record of p=reject. I decided to put some of those bounces here so confused users could find out what they needed to do.
smtp;550 5.2.0 meQj1n01053u42A0HeQj3v Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001
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. Please visit http://support.google.com/mail/answer/2451690 to learn about DMARC initiative. 100si2781324qgv.4 – gsmtp
Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. ua2si8779123
550 5.7.0 (COL0-MC6-F31) Unfortunately, messages from (IP) on behalf of (yahoo.com) could not be delivered due to domain owner policy restrictions. (in reply to end of DATA command))
smtp;550 5.7.1 DMARC failure for domain yahoo.com, policy reject
554 5.7.9 Message not accepted for policy reasons. See http://postmaster.yahoo.com/errors/postmaster-28.html (in reply to end of DATA command))
What can you do if you get one of these bounces?
Endusers can do a couple things. For one-to-one mail make sure you’re using the Yahoo outgoing mail servers and that should fix the problem without you having to really make any change. For email to mailing lists you’ll need to switch to an email address at another domain for that mailing list.
If you’re sending mail through an ESP, you’re going to need to change your header-from address to something other than a @yahoo.com address. This is going to break some things, unfortunately, but as long as Yahoo is publishing this record, you’re not going to be able to use Yahoo.com addresses for your commercial mail.