Hi! First of all, my apologies. I'm not an expert in Linux and I think that this question is motivated because of my lack of experience. I have just installed the last version of OTRS. My configuration is: RedHat 7.2 Apache 1.3 / mod_perl MySQL OTRS 1.1.3-01 (rpm for RedHat 7). So I downloaded the rpm for this version of RH and installed it. Then I went through installer.pl and everything seemed to work properly. The problem is email. This computer is working in a local area network and has NO access to internet. In fact, it is an internal server used for private purposes. We also have our own email server (MS Windows 2000 Server, Exchange 5.5 SP4). This server is used for both internal and external mail. Well, I want to create user's accounts in OTRS and specify their corporative email. When I try to do this using the create client option in the administrative section, I get the following error: Nov 11 13:03:34 ANTILLA OTRS-CGI-1[5139]: [Error][Kernel::System::CustomerUser::DB::CustomerUserAdd][Line:295]: Email address (someuser@yourdomain.com) not valid (invalid someuser@yourdomain.com (mx)! )! (I have changed the actual email address in the previous message). Then, reading the manual, I noticed that it is possible to use an SMTP mail server. To do it, I added the following lines to Config.pm: $Self->{'SendmailModule'} = 'Kernel::System::Email::SMTP'; $Self->{'SendmailModule::Host'} = 'exchange.mydomain.com'; $Self->{'SendmailModule::AuthUser'} = 'myuser'; $Self->{'SendmailModule::AuthPassword'} = 'mypassword'; Then, I restarted the web server and tried to create the new user again. The error is the same. Noticing that there is a warning about the MX record, and since my computer has no access to the internet (I use the hosts file to solve internal ip addresses) tried to disable the "Check MX" option. So I went again to Config.pm and modified the corresponding line so now it looks like this: $Self->{CheckMXRecord} = 0; I repeated the whole process: restart Apache, add the new customer. The error message is again the very same. So I assumed that the options where stored somewhere else (you may think, why?) But my weird thinking went this way. So I decided to execute again installer.pl. When I tried to do this, I got a warning in my browser saying that I have to disable the secure mode if I want to do this. Well, I went back again to Config.pm and modified the secure mode line like that: # SecureMode # (Enable this so you can't use the installer.pl) $Self->{SecureMode} = 0; Again, I restarted apache and navigated to installer.pl. The aswer was, AGAIN, that I had to disable the secure mode!!!! So it seems that OTRS is NOT reading the options in Config.pm.... Well, the original problem was: how to use SMTP instead of the mailing system provided by this unix server, so both the administrator and the customers use their Microsoft windows (Outlook) / exchange based email to send / receive emails from / to OTRS. I'd like to solve THIS problem, but perhaps this is not possible. If you can lend me a hand... I'd be very grateful to you! Perhaps this is not possible. I've seen that there are options about "POP 3 email" that I don't fully understand (I know what POP 3 is; perhaps the problem is that I do not understand the mail idiosynchrasy used by OTRS). Please, help me... Jose.