It was piece of cake to setup the LAMP-server and install OTRS with apt-get but I'am unsure how to setup a secure mailserver. I own a domain that I want to dedicate for this. I could use the domain with google apps to setup a mailaccount but google only let me only connect by POP3+SSL and SMTP+TLS. I found an module for OTRS to connect to POP3+SSL but I guess it wasn't configed for ubuntu because I can't get it working. I installed Postfix after an HOWTO-guide and I think it works but I'am unsure how secure it is. I don't want do be abused to send SPAM. So I would like some links or help how I should solve my problem. I'am not totaly a newbi to linux but I'am unsure when it comes to setup an secure mailsystem.