Related Clues:
- URL opener
- Abbr. spotted in the mailroom
- Common Internet letters
- Run before WWW
- Cover sheet abbr.
- Envelope or memo abbr., perhaps
- Mailroom abbr.
- Abbr. often before a name
- Ltr.-routing word
- Letters before ://www
- Internet initials
- Letters before a colon
- Business-envelope abbreviation
- Ltr. directive
- Abbr. before a colon