Related Clues:

• Bus. letter abbr
• Mail routing abbr
• Env. inside an env., e.g
• Abbr. before a memo recipient's name
• Envelope notation
• Env. fattener
• Abbr. on memos and fax cover pages
• Address block abbr
• Ltr. heads-up
• Start of a subj. line
• Memo-heading abbr
• Check in an env., e.g
• Interoffice mail abbr
• Letter's "To:" line: Abbr
• Abbr. at the top of a 111-Down