| PM_BLOCK_USER_DISALLOW_BLOCKING | pm_block_user/pm_block_user.module | Disallow blocking private messages from a user. | 6 | 1 | 
          
                  | PM_BLOCK_USER_DISALLOW_SENDING | pm_block_user/pm_block_user.module | Disallow sending private messages to a user. | 3 | 1 | 
          
                  | PM_EMAIL_NOTIFY_LEVEL_ALL | pm_email_notify/pm_email_notify.module | Enable e-mail notifications for all messages. | 6 | 1 | 
          
                  | PM_EMAIL_NOTIFY_LEVEL_DEFAULT | pm_email_notify/pm_email_notify.module | Enable e-mail notifications and use the global default. | 3 | 1 | 
          
                  | PM_EMAIL_NOTIFY_LEVEL_DISABLED | pm_email_notify/pm_email_notify.module | Disable e-mail notifications. | 5 | 1 | 
          
                  | PM_EMAIL_NOTIFY_LEVEL_THREAD | pm_email_notify/pm_email_notify.module | Enable e-mail notifications only for new threads. | 2 | 1 | 
          
                  | PM_EMAIL_NOTIFY_LEVEL_UNREAD_ONCE | pm_email_notify/pm_email_notify.module | Enable e-mail notifications only once until a user visits a threads. | 2 | 1 | 
          
                  | PRIVATEMSG_READ | ./privatemsg.module | Status constant for read messages. | 7 | 1 | 
          
                  | PRIVATEMSG_UNLIMITED | ./privatemsg.module | Show unlimited messages in a thread. | 2 | 1 | 
          
                  | PRIVATEMSG_UNREAD | ./privatemsg.module | Status constant for unread messages. | 3 | 1 |