Helpdesk ticket system

[Eric Kom]

Good day all,
I don't know if this question can me asked on this mailing list; if not,
can someone gently direct me?
I got a running mail system based on postfix and dovecot for more than 5
years now and would like to implement a ticket system so that incoming
mails are attributed a ticket number for the help desk support to be use.
Thank you in advance.