very similar to http://forum.osticket.com/d/discussion//resolved-urgent-bug-truncated-mails-in-v1-10I think osTicket has some trouble with Unicode Symbols since it truncate mails.For example, the mail (here it is the plain text of the mail body)
first text =F0=9F=8C=9E=20
last text
is truncated after 'first text'. The Content-Type of the original mail is: text/plain; charset=UTF-8