Multiple customers will send email to mailinglist@domain.com. (planned work, means customers will send email when work will start and when they end. OTRS is there only to log the planned work!)
1. OTRS will pickup the mails sent to that list. When picked up, OTRS would send ticket ID to customer who sent email.
2. When customer resolves issue and sends mail again with ticket ID to mailinglist@domain.com, OTRS should close ticket previously opened.
I managed to figure out the first part, about sending ticket ID to customer, but I'm unable to proceed further on the second issue. I read somewhere about setting X-OTRS-FollowUp-State: closed successful but I'm not sure about how to set up complete filter to achieve the desired result. Any detailed help appreciated
