Possible Clues:

• After parking beside one, do nothing yet
• Shelve
• Mail to open, in a flurry? Do it later!
• Shelve mail — perhaps open later
• Stop open, abnormal delay
• It's not so off-putting to put a soft-sounding one in the letter box
• Put off to later
• Reschedule for a later date
• Put off job, one involving little power
• Put off until future date