[rt-users] Email configuration question

[CT]

Greetings..
I am in the process of setting up an RT system for our organization.
OS - Solaris 10 (sparc) - on a sparse root zone
MTA - PostFix
User Base <100

I am still reading the docs and will do a manual installation since the 
Blastwave  solution
is not current.

My question
Does the RT server need to be able to receive email, or can the user 
just create a ticket
via the web interface. (the server sending email from the server is not 
an issue,  all of  our
Solaris boxes send system messages to our email address via PostFix)
My reason for asking is that this will require to us to get an MX record.

much thanks
Charles