I configured a Virtual Private Server as send-only mail server with exim4. Anyway, when I send an email to a Gmail account, it is marked as spam, because "it violates the guidelines for the sender recommended by Google.".
I checked if my domain name isn't blacklisted, and it isn't.
I also create a record A with my domain which I used as reverse DNS for my VPS.
I can't figure out the problem. Can anyone help me?