I have a strange problem when trying to send answers to customers for a ticket. For some of my users I get the following error when I try to send them an e-mail: -----------8<-------------8<------- ERROR: OTRS-CGI-69 Perl: 5.8.7 OS: linux Time: Wed Jan 10 23:51:28 2007 Message: Can't send to: n.competiello@activaseguridad.com! Enable debug for more info! Traceback (7490): Module: Kernel::System::Email::SMTP::Send (v1.11) Line: 96 Module: Kernel::System::Email::Send (v1.19) Line: 476 Module: Kernel::System::Ticket::Article::ArticleSend (v1.128) Line: 1557 Module: Kernel::Modules::AgentTicketCompose::Run (v1.21) Line: 353 Module: Kernel::System::Web::InterfaceAgent::Run (v1.17) Line: 671 Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::han dler (v) Line: 47 Module: (eval) (v1.81) Line: 203 Module: ModPerl::RegistryCooker::run (v1.81) Line: 203 Module: ModPerl::RegistryCooker::default_handler (v1.81) Line: 169 Module: ModPerl::Registry::handler (v1.99) Line: 30 -----------8<-------------8<------- But with some other users sending them mails works fine so it does not seem to be a configuration issue. How can I enable debug mode? Please need help. Best regards Oriol