Hi I have been getting this messageregularly "An error occurred while sending mail. The mail server responded: 535 5.7.8 [TPG-A02] Authentication denied" .
I change the password.
I change the outgoing mail to 465
I change the incomming mail 995
I check the sever requires verification
etc. etc. etc.
I works for a few days and fails again.
Hey, sueshaun. Since you have performed all the necessary troubleshooting you may raise this directly to postmaster to get real-time update.
Send an email to firstname.lastname@example.org
Let us know how it will go.