Hey Everyone, I am not able to send emails to an address outside of our local network. Inside the network everything works fine, but as soon as I send an email to our customers OTRS reports an error: Message: Can't send to: maetra@gmx.de! Enable debug for more info! Traceback (1148): Module: Kernel::System::Email::SMTP::Send (v1.6) Line: 128 Module: Kernel::System::Email::Send (v1.3) Line: 108 Module: Kernel::System::Ticket::SendArticle::SendArticle (v1.15) Line: 185 Module: Kernel::Modules::AgentCompose::SendEmail (v1.58) Line: 376 Module: Kernel::Modules::AgentCompose::Run (v1.58) Line: 78 Module: ModPerl::ROOT::ModPerl::Registry::D_3a_otrs_otrs_bin_cgi_2dbin_index_2epl::handler (v) Line: 688 Module: (eval) (v1.66) Line: 184 Module: ModPerl::RegistryCooker::run (v1.66) Line: 184 Module: ModPerl::RegistryCooker::default_handler (v1.66) Line: 154 Module: ModPerl::Registry::handler (v1.99) Line: 16 I am sure this has something to do with the setting of CheckEmailAddresses in the config.pm file. But I don't know how to solve this. If I change the value of CheckEmailAddresses to 1 I get Server Error 500. Same thing if I just leave CheckEmailAddresses out. Thanks in Advance, Andreas Bublitz