So I've been doing lots of configs, and something I've done, somewhere along the line, has disabled auto-replies. OTRS 4.x CentOS 7.x MSSQL Backend (fully functional, I know it is not supported!) I have a queue (Q1) that receives all messages from a postmaster mail account (MAIL1) via POP3. The ticket is created successfully. There is an autoreply set on this queue, which is never submitted to the mail server (whether SMTP, SendMail or anything else, there is no attempt made to send this message at the MTA level). I can reply, respond etc fine from the ticket itself, OTRS is working as far as emails go, except the autoresponse. Notably (probably of relevance), when the email is picked up, an error is thrown: ERROR: OTRS-otrs.PostMasterMailbox.pl-99 Perl: 5.16.3 OS: linux Time: Mon Nov 30 14:40:03 2015 Message: The field configuration is invalid Traceback (6328): Module: Kernel::System::DynamicField::Backend::ValueSet Line: 426 Module: Kernel::System::Ticket::Event::TimeUpdate::Run Line: 158 Module: Kernel::System::EventHandler::EventHandler Line: 226 Module: Kernel::System::Ticket::Article::ArticleCreate Line: 401 Module: Kernel::System::Ticket::ArticleCreate Line: 195 Module: Kernel::System::PostMaster::NewTicket::Run Line: 564 Module: Kernel::System::PostMaster::Run Line: 368 Module: Kernel::System::MailAccount::POP3::Fetch Line: 216 Module: Kernel::System::MailAccount::MailAccountFetch Line: 441 Module: main::Fetch Line: 171 Module: /opt/otrs/bin/otrs.PostMasterMailbox.pl Line: 85 Through some astute reading, I know this error is triggered from line 426 (actually from ln428) of the backend.pm file, but that doesn't help me narrow down the cause. Stepping through these other files hasn't led me to the answer, except to be fairly convinced it is the problem. Dynamic fields defined in the system include, (source module) name of field: (KIX4OTRS) KIXFAQEntry (?) ProcessManagementProcessID (?) ProcessManagementActivityID (ITSMCore) ITSMCriticality (ITSMCore) ITSMImpact (SystemMonitoring) TicketFreeText1 (SystemMonitoring) TicketFreeText2 (SystemMonitoring) ArticleFreeText1 Invalidating some of these fields makes no difference, the error occurs. Probably no surprise there, if it needs the field, it needs the field. I have tried with both SenderFrom and EnvelopeFrom set and unset, no difference. What could be causing auto-replies to not be generated? What other investigative paths should I take? I am hitting a brick wall here, I can't see anything wrong with the configs except the error about dynamic fields but I cannot be even sure that is related. The auto-response is simple, plain text, doesn't even use any OTRS fields during the testing I am doing. Any advice, guidance or direction on restoring the missing auto-reply functionality would be great! Cheers Rob Shears.