I just started getting the error message below this morning when trying to send emails out to customers (email address and IP have been masked). The emails are going out to the customers successfully though. Backend ERROR: OTRS-CGI-10 Perl: 5.10.1 OS: linux Time: Mon Mar 17 08:27:16 2014 Message: Impossible to send message to: first.last@example.com . RemoteAddress: X.X.X.X RequestURI: /otrs/index.pl Traceback (1210): Module: Kernel::System::Ticket::Article::ArticleSend (OTRS 3.3.5) Line: 2083 Module: Kernel::Modules::AgentTicketCompose::Run (OTRS 3.3.5) Line: 784 Module: Kernel::System::Web::InterfaceAgent::Run (OTRS 3.3.5) Line: 871 Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 41 Module: (eval) (v1.99) Line: 204 Module: ModPerl::RegistryCooker::run (v1.99) Line: 204 Module: ModPerl::RegistryCooker::default_handler (v1.99) Line: 170 Module: ModPerl::Registry::handler (v1.99) Line: 31 Any assistance would be greatly appreciated! Nick