Mail Delivery Failure

[cowgirlsoutpost]

Hi, I am using Prestashop 1.6.1.11. We are having problems with our email system not sending any confirmation emails for orders. Here is one of the error messages we receive :

host mta6.am0.yahoodns.net [66.218.85.139]
SMTP error from remote mail server after end of data:
554 5.7.9 Message not accepted for policy reasons.

And another message:

host mx-aol.mail.gm0.yahoodns.net [98.137.157.43]
SMTP error from remote mail server after end of data:
554 5.7.9 Message not accepted for policy reasons.

And one more:

host mx2.comcast.net [68.87.20.5]
SMTP error from remote mail server after end of data:
550 5.2.0 pzHkeGkbUl0aLpzHleUNlz Message rejected due to DMARC.

I am stumped in trying to fix this and appreciate any help!
 

[sga31]

hello


I have the same problem

 

[jimmyc]

Any solutions?