Related Clues:

• If it's canceled, it has been accepted
• Post office buy
• Mark of approval
• Mailer's need
• Snail mail attachment
• Snail mail need
• Post-office purchase
• Postage purchase
• Hallmark
• Philatelist's love
• It may be licked
• Show impatience, in a way
• Notary's need
• Visa marking
• Sender's need