Problem when closing ticket

[iztok]

Oops! An Error occurred.
Error Message: Impossible to send message to: my.mail@company.si, .

.

You can or go back to the previous page.
Error Details
Backend ERROR: OTRS-CGI-10 Perl: 5.10.1 OS: linux Time: Wed Dec 21 09:51:57 2011 Message: Impossible to send message to: my.mail@company.si, . Traceback (9879): Module: Kernel::System::Ticket::Article::ArticleSend (v1.305) Line: 2186 Module: Kernel::Modules::AgentTicketCompose::Run (v1.156) Line: 710 Module: Kernel::System::Web::InterfaceAgent::Run (v1.62) Line: 865 Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 46 Module: (eval) (v1.90) Line: 204 Module: ModPerl::RegistryCooker::run (v1.90) Line: 204 Module: ModPerl::RegistryCooker::default_handler (v1.90) Line: 170 Module: ModPerl::Registry::handler (v1.99) Line: 31

Running 3.1.0 beta3 @ Ubuntu linux

[jojo]

the server is not allowed to send a mail via SMTP

[iztok]

After further investigation it appears so. Many thanks for help.