Impossible to send message to:

[Gregor]

What does the following message mean? The mail goes out even though the error message:


Backend ERROR: OTRS-CGI-10 Perl: 5.12.3 OS:
linux Time: Mon Mar 23 15:27:47 2015
Message: Impossible to send message to:
email@bernd-schad.de . RemoteAddress:
192.168.112.30 RequestURI: /otrs/index.pl
Traceback (30159): Module:
Kernel::System::Ticket::Article::ArticleSend
(OTRS 3.3.9) Line: 2083 Module:
Kernel::Modules::AgentTicketCompose::Run
(OTRS 3.3.9) Line: 784 Module:
Kernel::System::Web::InterfaceAgent::Run
(OTRS 3.3.9) Line: 871 Module: /opt/otrs
/bin/cgi-bin/index.pl (unknown version)
Line: 41

[crythias]

Start with this search and let us know what you find that doesn't answer your question.