Hello, A question about the way OTRS works. Let's say: -You receive support requests at support@domain -You, as an agent, need to open a ticket, so you open a ticket which will have support@domain as email address -The ticket finishes in a queue where follow up after close it's not possible. -The ticket is closed so the system will send a notification to the user (support@domain) -The system receives the mail and will think it's a follow up for that ticket so it will reject it. -The rejected notification will be sent to support@domain so we'll have an infinite loop. Is this right? Will loop protection prevent this? Which is the official advice to prevent this? Because although the loop protection works, you'll have a 'dirty' history for that ticket? And by the way, the sysadmin option "PostmasterMaxEmails" says "Maximal post master daemon email to own email-address a day. Loop-Protection! Default: 40" so if the systems receives 40 mails a day it will stop? What does it mean? Thanks a lot in advance, J