Failed to send to yahoo

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Hi
I am InmotionHosting customer.
when sending to Yahoo addresses :

Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

*********@yahoo.fr
host mx-eu.mail.am0.yahoodns.net [188.125.69.79]
SMTP error from remote mail server after end of data:
554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit http://postmaster.yahoo.com/errors/postmaster-27.html [120]
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johnpaulb-imhs1
Hello enanot5, Thank you for your contacting us about an email failing to send (being returned) to yahoo. The link provided by yahoo did not resolve to a useful page, but I was able to find some information on this error in the cPanel forums. Ensure you have SPF/Domain Keys setup, as well as DMARC for your domain. Check that you do not have any Common words that trigger spam filters. Also, if this is part of a bulk mail, here is a helpful link to Yahoo's Bulk email industry standards and best practices. If you have any further questions, feel free to post them below. Thank you, John-Paul