SendMail - Route if no matching rule found

[CDAG]

We have lots of entries in the MBT and VirtUserTable.

These are your typical entries in the format of:
MBT:

JohnDoe JohnDoe@subdomain.domain.com

VirtUserTable:
JaneDoe@domain.com JaneDoe@subdomain2.domain.com

I consider this process to be an "if - then - else" type of statement. If JohnDoe then JohnDoe@subdomain.com.

However, according to our mail administrator, there's no way to have an "else" meaning there's no way to have a rule that forwards the mail if no matching rules are found. Ideas?

If it's unclear let me know.

Thanks!
C