Related Clues:

• Put shoes on?
• Envelope stick-on
• Perforation site
• Mailing need
• If it's canceled, it's accepted
• Not take 'no' for an answer
• Forever ___
• An e-mail doesn't need one
• Don't take no for an answer
• Corner piece?
• Notary public's device
• "Forever" post office product
• Impress with a mark
• Continue to assert, maintain
• Persist in pressing