Related Clues:

• Bus. envelope abbr
• Business-envelope abbr
• Business letter abbr
• Mail-routing abbr
• Abbr. before some addressees
• Letters followed by a colon
• Start of a memo heading
• Business env. letters
• Email command
• Routing abbr
• Fax abbr
• Memo heads-up
• Meant for, for short
• ''It's for,'' for short
• Cover sheet abbr