Problem dropping MySQL user

MySQL 4.1.14.

If you can not drop a user because you get the following error:

mysql> drop user 'username'@'domain';
ERROR 1268 (HY000): Can't drop one or more of the requested users

Revoke all privileges first:

mysql> REVOKE ALL PRIVILEGES FROM 'username'@'domain';
Query OK, 0 rows affected (0.00 sec)

Then drop the user.

mysql> drop user 'username'@'domain';
Query OK, 0 rows affected (0.00 sec)