Related Clues:

• Impress
• Postage
• Album entry, perhaps
• Envelope item
• If it's canceled, it has been accepted
• Post office buy
• Amtrak offering
• Mark of approval
• Mailer's need
• Amtrak's 'bullet train'
• Snail mail attachment
• Snail mail need
• Emboss
• Post-office purchase
• Amtrak train