At the moment, the mail relay is reached just from inside our company and several applications use it to send mail through Internet. In this scenario, one of these applications take the user "f...@mycompany.com" and send mail to the Postfix relay. So the apps will be configured in this way (after your advice):
Postfix server: x.x.x.x Port: TCP/587 Security: STARTTLS User: f...@mycompany.com Pass: <empty> Using mailx is in this manner: $ mailx -v -r "f...@mycompany.com" -s "TLS test" -S smtp="10.10.12.5:587" -S smtp-use-starttls -S ssl-verify=ignore u...@gmail.com That last question please: what type of authentication is this? Normal password ? This implies an extra line un main.cf? Hundreds of thanks :) Jelo On Mon, Mar 13, 2017 at 4:38 PM, Viktor Dukhovni <postfix-us...@dukhovni.org > wrote: > On Mon, Mar 13, 2017 at 04:33:15PM -0300, Jeronimo L. Cabral wrote: > > > Sorry, I repeat Postfix doesn't need to authenticate any user sending > > through it (not login/password) > > Why is that? How are you planning to prevent abuse by spammers > exploiting open relays? > > -- > Viktor. >
