Hi; We have a postfix Email server . when someone telnet to port 25 on our server, it is possible to send email from any ID user1@ anydomain to any user2@ mydomain
telnet x.x.x.x 25 ehlo localhost mail from:user@anydomain sender OK rcpt to: user@mydomain recipient OK The question is that: Is there any solution to prevent this matter or somehow make postfix to authenticate the users telneting the server directly? By the way, our email server is not an open relay server. Thanks
