Hello,As in the subject - we have a problem that osticket 1.9.12 is not sending auto-response to one of our customers. There is no log on e-mail server regarding an attempt to send auto-response. Every other activity - reply to a ticket etc. works fine. Only auto-response and only to that specific customer is not working.I don't know what to do, can't find any osticket logs for that kind of activity. System log show no errors, set to debug level. Connection is made by SMTP.OS is Ubuntu 14.04.5 LTS. Please help.