+Adds this mail forwarding alias to the database. If there is an error, returns
+the error, otherwise returns false.
+
+The additional fields pkgnum and svcpart (see L<FS::cust_svc>) should be
+defined. An FS::cust_svc record will be created and inserted.
+
+Currently available options are: I<depend_jobnum>
+
+If I<depend_jobnum> is set (to a scalar jobnum or an array reference of
+jobnums), all provisioning jobs will have a dependancy on the supplied
+jobnum(s) (they will not run until the specific job(s) complete(s)).