If you use Thunderbird as your e-mail program, you can label an e-mail you have selected with the number keys.

By default, these keys will apply the label and color listed:

• 1: Important (red)
• 2: Work (yellow)
• 3: Personal (green)
• 4: To Do (blue)
• 5: Later (purple)
• 0: Clear all labels (black)