BT rejecting xenforo notifications via Amazon SES

Mr Lucky

Well-known member
Since yesterday evening all notifications from my forum sent via Amazon to btinternet are being bounced. I have been sending via Amazon for quite a few weeks with no issues until this.

Diagnostic-Code: smtp; 554 Message rejected for policy reasons (

Other notifications seem to be OK and test single emails from my computer sent via same Amazon SES account seem to be fine.

Does anyone know what could be causing this? Thanks