Im trying to setup auto response but having some issues. When adding the lines bellow to the Config.pm file as per docs, # (Where is sendmail located and some options. # See 'man sendmail' for details. Or use the SMTP backend.) $Self->{'SendmailModule'} = 'Kernel::System::Email::Sendmail'; $Self->{'SendmailModule::CMD'} = '/usr/sbin/sendmail -t -i -f '; $Self->{'SendmailModule'} = 'Kernel::System::Email::SMTP'; $Self->{'SendmailModule::Host'} = 'mail.redcheckhosting.com'; $Self->{'SendmailModule::Port'} = '25'; $Self->{'SendmailModule::AuthUser'} = 'support+redcheckhosting.com'; $Self->{'SendmailModule::AuthPassword'} = 'RedCheck1728'; I get this error: ERROR: OTRS-CGI-10 Perl: 5.6.1 OS: linux Time: Fri Oct 17 09:01:58 2003 Message: SMTP authentication failed! Enable debug for more info! Traceback (28022): Module: Kernel::System::Email::SMTP::Send (v1.3.2.2) Line: 104 Module: Kernel::System::Email::Send (v1.1.2.1) Line: 52 Module: Kernel::System::Ticket::SendArticle::SendArticle (v1.11) Line: 180 Module: Kernel::Modules::AgentCompose::SendEmail (v1.46) Line: 353 Module: Kernel::Modules::AgentCompose::Run (v1.46) Line: 78 Module: index.pl (v1.58) Line: 608 What could be the problem? ----------------------> Nelson Pereira www.Ott-Motorcycles.ca