Provide a white list in privacy and security for domains which should not be rejected by Yahoo policy error code 554
Provide a white list in the privacy and security settings for domains which you always want to receive so that it is never rejected by Yahoo policy error code 554 Message not allowed (PH01) reason P.
These are legitimate emails so the Yahoo mail filter clearly not working correctly at all and we need this fixing NOW (or sooner!)

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Ray Calladine commented
It is really useless if the email provider does not provide a mechanism to ensure important emails arrive because their privacy and security filters are unable to give the user a way to ensure important emails arrive - I mean if you cant guarantee you will receive the email the only alternative is to find a new email provider whose system CAN guarantee this - even if you have to define it in a white list. I have missed important emails from my employer thanks to this nonsense in Yahoo Mail