Related Clues:

• Abbr. before a name on top of a memo
• Env. thickener
• Routing aid: Abbr.
• Fax cover sheet abbr.
• Business memo abbr.
• Letters in a bus. letter
• Return envelope, e.g.: Abbr.
• It's inside an env.
• Business-env. letters
• 'Eyes only' abbr.
• SASE, e.g
• Business envelope abbr
• Memo abbr
• Envelope abbr
• E-mail heading: Abbr