Customer Support / RT Helpdesk Setup and Configuration

I require a request tracker / customer service system, perhaps based on RT Helpdesk since it does these things fairly? easily, ? that does the following things. 1.? Picks up email from a POP mailbox with content in it (new cases, updates etc) 2.? Auto Responds to the submitter which may be inside the email (when submitted from a web form) or the from and/or reply to address to acknowledge the request and assigns a case number. 3.? Emails out to a mailing list of people who can respond to a case 4.? Picks up response emails which can include the following text: a.? MINE (means the person responding wants the ticket assigned to them) b.? UPDATE (means the person responding wants the text of the email updated in the case) c.? CLOSED (means the issue has been dealt with, and the body of the email is appended to the case) 5.? Has a web based interface for case review or complicated/long term responses and/or projects and permits reminders / escalations to be turned on and off 6.? Automatically sends reminders every? 12 hours to the owner? until a case is closed unless changed in 5. above.? It would be even better if this was configurable easily in the case in 5. above. 7.? Automatically escalates to the administrator if a case has not been owned in 48 hours.