Thanks for the reply. I updated this thread with a post containing our answer. Turns out we had the "Test SMTP delivery" box checked under the delivery template properties.

Forgot to update this thread with the answer we found. Turns out all it took was unchecking a box within the delivery template properties "Test SMTP delivery". We continue to get the same error messages but they do not appear to affect our deliveries in any way.

Hi, I recently set up ACC within an AWS ec2 instance. Also set up postfix on this which is working. However, when creating a delivery within the ACC console the email delivery is showing as sent but is never received. The relay I set up seems to be working as I am seeing the successful connection wi...