RSS Feed/News Strange error 554 with mail sent to yahoo

[ENXF NET]

I got an error from yahoo in the mail error log that made me wonder:

The mail system

<$[email protected]>: host mta7.am0.yahoodns.net[98.136.96.77] said: 554
Message permanently deferred due to unresolvable RFC.5321 from domain. See
https://senders.yahooinc.com/error-codes#unresolvable-from-domain (in reply
to end of DATA command)

Final-Recipient: rfc822; $[email protected]
Original-Recipient: rfc822...

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