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/>

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