I'll look at the MX record - but I reclon I'm just going to have to edit the emails.
As I suppose that this is for a Zen Cart install and that some or many of your potential customers might come from the AOL mail bank...I would tread softly into what you have described as AOL: mail will bounce/not be delivered if their requirements are not met.

This will preclude your using strange email forwards/masking and the like. The mailserver and the domain initializing the message must be from known (to the inet) sources or it is classed as spam and discarded.

Your purchase notifications and other mail will not arrive at any AOL address when sent from Zen Cart through any kludged mail server configuration.

Just so you are aware