PH01 is their phishing rejection. They see something they don't like in one
of the URIs. They usually fix these false positives pretty quick if you
submit a ticket here
<https://io.help.yahoo.com/contact/index?page=contactform&locale=en_US&token=Zh/BBVqXzLHlIbokbUqVWTUbuuQeXGkGnZzhKR2JQ4O6mMQdy9JSWdtWFXvjthcYCRj9bUIFfycOfG+4GOHPHoOGa8HwDO2+0kYRtTcdR8O13Mvs9cOruJ0TlC3hh4bCEtPlZ0yk7fvp1MFjGnAOWw==&selectedChannel=email-icon>
.

On Thu, Dec 2, 2021 at 7:16 PM John Levine via mailop <mailop@mailop.org>
wrote:

> An IETF friend of mine is trying to set up a personal domain at hosting
> company Pair.
>
> When he sends mail to a verizon.net recipient, which is hosted at
> AOLYahoo, it rejects
> it after data with
>
>   554 Message not allowed - [PH01] Email not accepted for policy
>   reasons.  Please visit https://postmaster.yahooinc.com/error-codes (in
>   reply to end of DATA command)
>
> These are low volume personal messages.  His domain housley.us was
> registered two
> years ago but I don't think has been used for mail before.  I looked at
> Pair's outgoing
> mail to my system which looks quite clean, and he says other people can
> send from Pair
> to Yahoo, so my guess is that it doesn't like getting mail from new
> domains, even at
> low volume.
>
> Any suggestions?  Pair's support has no ideas.
>
> R's,
> John
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