Related Clues:

• Sends postally
• Ships, perhaps
• Posts, as a postcard
• Sends via USPS, maybe
• Net transmissions
• Sends away, as a letter
• Entrusts to the USPS
• Sends, like a letter
• Uses USPS
• Uses a collection box, say
• Sends flying, perhaps
• Sends letters
• Sends in an envelope