[rt-users] RT Email Questions

[Stevo]

Hey Guys,

I have a couple of questions relating to using email to update / create 
tickets.

1)  What is the minimum information I need in the subject line for the email 
to be appended to an existing ticket?
2)  Currently if the subject line doesn't match an existing ticket, RT 
creates a new ticket.  Can this be prevented?  Ie send a bounce back to the 
person sending the original email??

Does this make sense?!

Thanks

Stevo