Hi,
I have one mail server running postfix and own a domain (foo.com), i've noticed that when i try to send an email to the "outside" (other domains different than mine) i have to authenticate myself against the server in order to be able to send the email otherwise it will give me a relay access denied error. Until this point everything is ok. My doubt is that when i connect to the server and try to send an email to one of my users, for example b...@foo.com it doesn't ask me for any password. i repeat, when i try to send an email to one of my users using _my server_ it doesn't ask me for any kind of authentication (i'm not talking about sending an email to one of my users using another mail server in the internet). How could i enforce the server in order to authenticate the mails that are being sent _from_ my server no matter what destination domain is, and if the authentication is not successfull it reject the email? Thank you
