Hi, I can receive through POP server of my exchange (SBS 2003) but no way to send. I've tried a lot of different configs, even with sendmail (no Exchange) I can't.. Does anyone have a clear explanation how to configure with Exchange to send through it ? (in french it's better J ) or with a sendmail for Windows (Exchange is not mandatory)? Here is the kind of error I have with Exchange : ERROR: OTRS-CGI-01 Perl: 5.10.0 OS: MSWin32 Time: Thu Apr 9 12:09:52 2009 Message: Can't connect to serverml.XXXXX.XXXX: Unknown error! Traceback (1936): Module: Kernel::System::Email::SMTP::Send (v1.21.2.2) Line: 91 Module: Kernel::System::Email::Send (v1.45) Line: 553 Module: Kernel::System::Ticket::Article::ArticleSend (v1.185.2.2) Line: 1832 Module: Kernel::Modules::AgentTicketEmail::Run (v1.68.2.1) Line: 847 Module: Kernel::System::Web::InterfaceAgent::Run (v1.35) Line: 824 Module: ModPerl::ROOT::ModPerl::Registry::C_3a_Program_20Files_OTRS_OTRS_bin_cgi_2db in_index_2epl::handler (unknown version) Line: 50 Module: (eval) (v1.87) Line: 204 Module: ModPerl::RegistryCooker::run (v1.87) Line: 204 Module: ModPerl::RegistryCooker::default_handler (v1.87) Line: 170 Module: ModPerl::Registry::handler (v1.99) Line: 31 Thanks J,