[otrs] New user in OTRS

[Filippo Fiorani]

Hi,

I've installed OTRS (2.0.4) on a Debian 4.0 (Etch) server: I've followed 
"the easy way", using the .deb package.
I can log in and play around while reading OTRS docs. Everything looks fine.
Whenever I log in and try to add a new user (or a new client) tough, I get an error page 
with this:

ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Tue May  8 19:35:44 2007

Message: Email address (filippo.f at condor.it) not valid (invalid 
filippo.f at condor.it (no mail exchanger (mx) found!)! )!

Traceback (4323):
  Module: Kernel::System::User::UserAdd (v1.50) Line: 223
  Module: Kernel::Modules::AdminUser::Run (v1.31 ) Line: 192
  Module: Kernel::System::Web::InterfaceAgent::Run (v1.8) Line: 651
  Module: 
ModPerl::ROOT::ModPerl::Registry::usr_share_otrs_bin_cgi_2dbin_index_2epl::handler 
(v) Line: 47
  Module: (eval) (v1.80) Line: 203
  Module: ModPerl::RegistryCooker::run (v1.80) Line: 203
  Module: ModPerl::RegistryCooker::default_handler (v1.80) Line: 169
  Module: ModPerl::Registry::handler (v1.99) Line: 30

I've found something about this, telling me to disable CheckMXsomething 
in Config.pm... which I've found in /etc/otrs/Kernel and looked already 
turned off.

So, question is: what am I doing wrong or overlooking? What is my system 
missing? Is there any good-installation-checklist for otrs?

Thanks in advance for any help.
Cheers,
Filippo