Hello How can we secure are postfix smtp relay server?
For the moment we have a rule that only allow mail from exchange server adres to postfix (relay server), but when somebody spoofs this address mail gets accept and you can send your mail to anybody as anybody. When I check: [administrator@eqx-mailman02 ~]$ sudo postconf -a [sudo] wachtwoord voor administrator: cyrus dovecot So I know I can use these but we are not used of working with this. Can we setup another way of authentication? I would not like to setup users/mailboxes on the relay server, all are users are on the exchange server (AD), and postfix is are simple relay server we would like to secure. Thanks in advance ************************************************************ Any reaction to this e-mail or any other mail, including any files transmitted therewith to sender's e-mail address(es) shall be dealt with not as private, but as business communication(s) and shall be registered as such. ************************************************************
