While sending an email through OTRS, the following error is thrown if the recipient list contains an invalid email address:

ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Thu Mar 25 16:04:51 2010

Message: Can't send to 'email-id': 5505.1.1 <email-id>: Recipient address rejected: User unknown in relay recipient table
! Enable Net::SMTP debug for more info!

Traceback (3748):
   Module: Kernel::System::Email::SMTP::Send (v1.25) Line: 131
   Module: Kernel::System::Email::Send (v1.64.2.1) Line: 690
   Module: Kernel::System::Ticket::Article::ArticleSend (v1.232.2.1) Line: 2027
   Module: Kernel::Modules::AgentTicketEmail::Run (v1.99.2.3) Line: 812
   Module: Kernel::System::Web::InterfaceAgent::Run (v1.43.2.1) Line: 819
   Module: ModPerl::ROOT::ModPerl::Registry::opt_otrs_bin_cgi_2dbin_index_2epl::handler (unknown version) Line: 48
   Module: (eval) (v1.88) Line: 204
   Module: ModPerl::RegistryCooker::run (v1.88) Line: 204
   Module: ModPerl::RegistryCooker::default_handler (v1.88) Line: 170
   Module: ModPerl::Registry::handler (v1.99) Line: 31

However, this action actually creates a ticket in the OTRS interface. How this can be avoided?

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