Related Clues:

• 'That's really something!'
• ''Far out!''
• "Yikes!"
• "Man!"
• 'Amazing!'
• Snail mail enc.
• PO delivery
• Envelope encl.
• It may accompany a MS.
• Mail convenience: Abbr.
• MS. enclosure
• Arouse great enthusiasm
• Regale an audience
• Env. enclosure
• Huge success