[otrs] Follow up Non-sense

Whenever I activate the auto-reponse "reply", it works fine: the customer sends a mail to the OTRS system and then receives a notification. The problem is, that when I click on the History link of that same Ticket, i have a stupid follow up: FollowUp FollowUp for [20030902....] And the follow up is nothing but the auto-reply with one more blank line at the end. How can i remove this from the system ?