1) I'd like to prevent non-domain users from creating tickets in SDP. I realize I can do this at the mailbox/exchange level, but can I control this at the SDP level?

2) I'd like to remove all email requesters who aren't part of my domain.  Can I do a negative search in the requester filter (e.g., if *.mydomain.com showes me all the valid addresses, is there a way to get ^*.mydomain.com?)

Being able to use regular expressions in the field would be great

Thanks,

Adam