Stop message blocking with error 554
Yahoo email systems is still blocking emails sent from my gmail account with error 554. Error message is
"554 Message not allowed - [PH01] Email not accepted for policy reasons."
This includes sending email to yahoo.com, att.com, and provide.net. This has been happening for months, and it isn't just me, but has happened to many of my friends who use gmail.
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William Jaynes
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Please refer to this article to fix this issue: https://help.yahoo.com/kb/SLN5067.html