What mx records should I configure in my dns for the PMG?

[aosapanama]

Install a PMG and AWS with debian 11 and configure it according to the information but I'm a bit confused as to how I should configure the mx records in the domain that I want to filter, I have that domain hosted on an external server in hostgator and I want to place the PMG between my hosting and users, information from someone who already has it like this would be very helpful

 

[hata_ph]

Set your domain MX IP to your PMG, PMG will accept all the incoming email and filter/delivery the mails to your actual email server.
Assume you have setup correctly PMG with your email server.