Configure como:
...
domain=test.com
domain=anothertest.com
domainsasrealm=yes ; Use domains list as realms
; You can serve multiple Realms specifying several
; 'domain=...' directives (see below).
; In this case Realm will be based on request 'From'/'To' header
; and should match one of domain names.
; Otherwise default 'realm=...' will be used.
Atenciosamente