Checks to see if a rule already exists.
AFTKN_RULE_EXISTS or 883
BOOLEAN RuleExists( [ANSISTRING UserID]; ANSISTRING RuleName)
Allows someone to test if a rule exists for a proxied user assuming that the user has edit-rule rights on the proxied mailbox. If this parameter is not specified, the token assumes it should use the main logged-in UserID for the test. (Optional)
The name of the rule.
BOOLEAN. Returns True if a rule exists whose name matches that indicated by the Rulename parameter, False otherwise.