Related Clues:

• Mailing courtesy: abbr.
• Enc. with a manuscript
• "I'm amazed!"
• Ready-to-mail item, briefly
• 'Yowza!'
• MS accompaniment
• RSVP enclosure
• Enclosure with a MS
• Letter enc.
• MS. accompanier
• Return mailer (Abbr.)
• Exclamation of amazement
• Enclosure inside an enclosure, for short
• Encl. to facilitate a response
• "That's incredible!"