4.7.1 : Relay access denied

Hi there,

I’m having this weird issue with one particular server: no matter what, the post_smtp keeps throwing this message (4.7.1 <[email protected]>: Relay access denied) everytime it’s used. It only happens with one server I manage, yes it has a tight email seccurity. What I don’t know is which setting should I enable/configure to allow the post smtp to properly communicate with the smtp. (Running Ubuntu + Plesk + postfix).

Any and all help will be most appreciated.