[rt-users] Limiting Who Can Open Tickets

[Stevo]

Hey All,

Is there a way to limit who can create a ticket via email??  Right now I
have an email address that people use to create tickets and it gets a little
bit of spam and each time I get spam it opens a new ticket.  I'd like to be
able to restrict the opening of tickets from people who are either at a
specific domain or have accounts on our RT system.

I'm running RT3.0.6 and using Exim as my MTA.

Thanks

Stevo