Related Clues:
- Promise attendance, briefly
- Don't just show up
- Business-envelope abbreviation
- Ltr. directive
- Abbr. before a colon
- Routing letters
- 'Mayberry --' (old TV series)
- Initials on invitations
- Memo abbreviation
- Short answer?
- Rustic mail rte.
- Abbr. on an invitation
- Use Evite
- Abbr. on a memo
- Abbr. on a business envelope, perhaps