Impossible to send message to client

[bradfreedom]

detail of error:

Backend ERROR: OTRS-CGI-10 Perl: 5.12.3 OS: MSWin32 Time: Mon May 20 09:37:37 2013 Message: Impossible to send message to: test test <otrs1@gr.ma> . Traceback (2880): Module: Kernel::System::Ticket::Article::ArticleSend (v1.274.2.3) Line: 2046 Module: Kernel::Modules::AgentTicketCompose::Run (v1.124.2.10) Line: 534 Module: Kernel::System::Web::InterfaceAgent::Run (v1.58.2.3) Line: 862 Module: ModPerl::ROOT::ModPerl::Registry::C_3a_Program_20Files_OTRS_OTRS_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 49 Module: (eval) (v1.89.2.1) Line: 204 Module: ModPerl::RegistryCooker::run (v1.89.2.1) Line: 204 Module: ModPerl::RegistryCooker::default_handler (v1.89.2.1) Line: 170 Module: ModPerl::Registry::handler (v1.99) Line: 31

any help

[jojo]

check the logs of the mailserver