How can I find a list of all mail-enabled groups?

A. The mail attribute of mail-enabled groups is always populated with a value and has an object category of “group.” Using Dsquery with an LDAP route path, you can find all the mail-enabled groups, as follows:

dsquery * dc=savilltech,dc=net -filter "(&(objectcategory=group)(mail=*))" -limit 500 -attr displayName