Hello
We have setup a postfix server that serves as a relay server between the office and our fleet. The postfix gets his mails from the exchange server onboard. The restriction is set that only mails from the ip of the exchange are accepted. And this security rule works, from no other ip mails can be send. +But are sec officer is worried what is somebody gets in to the vm running the exchange server, or creates a vm that has the same ip as the exchange, than can you send mails without auth. That's why I'm searching to a way to secure are postfix server with password and username. I'm trying to setup sasl auth but with no luck. Does anybody have a good tutorial on how to setup this on postfix 2.10.1 on redhad 7.6 ? I have used soms tutorials but maisl get true without out. Authentication is only needed between exchange and postfix, postfix to postfix doesn't need auth Thanks in advance Met vriendelijke groeten Kind regards De Petter Mattheas Technical support engineer - projects team IT-Department Jan De Nul Dredging N.V. T +32 (0)53 73 95 53 F +32 (0)53 21 00 31 www.jandenul.com<http://www.jandenul.com/> ************************************************************ 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. ************************************************************