Related Clues:

• Postal letters?
• Envelope abbr.
• Env. extra
• Abbr. on an envelope
• Letter accompanier: Abbr.
• Abbr. in a business letter
• Env. stuffer
• A check, one might hope: Abbr.
• Multi-vol. set
• Abbr. at the bottom of a business letter
• Direct mail abbr.
• S.A.S.E., e.g.
• Went around
• Env. contents
• Business letter abbr.