This is just a handy one for people to keep hold of, I know there has been many times when it is just so much easier to setup an organisations email in one policy and then let the server do the rest for you...
So here are your most common:
%s : Surname (last name)
%g : Given name (first name)
%i : Middle initial
%d : Display name
%m : Exchange 2003 alias
All that needs to be done is edit the recipient policy and click add SMTP, then use any of the above given examples to constuct a default email address.
%email@example.com - firstname.lastname@example.org