| Function Description | 
| 
  priority (int level)
 | 
This function sets the 'X-Priority' header of the message.
Level must be between 1 and 5 and must be passed as an integer.
Levels are:
    
        
- 
1 - Highest
- 
2 - High
- 
3 - Normal
- 
4 - Low
- 
5 - Lowest
| Example | 
| 
   $mail->priority(1); // sets the priority to highest
 |