I have a new web server that always bounces mail to Yahoo, with the error:
554 Message not allowed - [PH01] Email not accepted for policy reasons
I have tried everything Yahoo support suggested to me but the problem persists.
Does anyone know how to configure WHM or cPanel so that the default SMTP server for a domain(s) is Gmail's SMTP?
I also found a paid service (SMTP2go) that could work but I have no idea how to setup the alternate SMTP. Any suggestions?