[clue] Problem with Comcast bounces.

[David L. Anselmi]

Chris Fedde wrote:
> Did we change or upgrade something on our mail server?  The message from
> comcast indicates that cluedenver.org has a published a DMARC policy and
> these messages violate it.  These would be published as SPF or TXT records
> in DNS or a DMIK.  I don't see an spf record for cluedenver.org Is there a
> DMIK?

So this appears to be the answer:

http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-breaks-mailing-lists.html

I didn't see any relevant headers in the message that caused the problem.  It's too bad that Yahoo 
gets to cause problems for mail that we're sending (but I'm sure there are people on the other side 
of the argument).

I haven't looked at the links in the article or researched how to work around the issue.  I'm open 
to ideas.

In the meantime I'm going to enable the Comcast accounts that were affected and block Yahoo accounts 
from sending.

Dave