Historical clue formulations

• Abbr. before a recipient's name on an envelope — 2026-08-17
• Memo abbr. — 2026-06-21
• Abbr. seen before a person's name — 2026-04-16
• Subject line abbr. — 2026-04-01
• Subject line abbr. — 2025-04-09
• Memo header — 2025-03-02
• Subject line abbr. — 2024-06-20
• Memo header — 2024-01-13
• Envelope abbr. — 2024-01-04
• Subject line abbr. — 2023-06-04
• Mailing label abbr. — 2023-05-23
• Abbr. before a name on an envelope — 2022-07-27
• Memo abbr. — 2022-01-16
• Subject line abbr. — 2022-01-13
• Subj. line heading — 2022-01-09
• Abbr. for routing of mail — 2021-06-14
• Package directive: Abbr. — 2020-11-05
• Memo header — 2019-12-08
• Memo abbreviation — 2019-10-16
• Abbr. at the top of an office memo — 2019-10-07
• Memo abbr. — 2019-06-02
• Abbr. on an envelope — 2019-05-05
• Envelope abbr. — 2018-12-23
• Envelope abbr. — 2018-10-12
• Start of a subj. line — 2018-10-05
• Abbr. on an envelope — 2018-09-05
• Memo heading abbr. — 2018-04-09
• Abbr. before a memo recipient's name — 2018-03-13
• Routing abbr. — 2018-03-08
• Memo heading abbr. — 2017-10-17
• Envelope abbr. — 2017-10-05
• Abbr. before a colon and a name — 2017-06-16
• Abbr. before a name on a memo — 2017-05-08
• Memo abbr. — 2016-12-16
• Memo abbr. — 2016-11-06
• Abbr. on a cover sheet — 2016-06-12
• Interoffice email abbr. — 2016-01-07
• Memo abbr. — 2015-04-12
• Memo abbr. — 2014-12-11
• Abbr. at the top of a memo — 2014-05-15
• Routing aid: Abbr. — 2014-04-11
• Subj. line alert — 2014-03-07
• Abbr. at the start of a memo — 2014-01-26
• Envelope abbr. — 2013-12-18
• Mailing label abbr. — 2013-08-04
• Cover sheet abbr. — 2013-07-24
• Memo abbr. — 2013-06-27
• Memo heads-up — 2013-06-22
• Envelope abbr. — 2013-02-24
• Routing abbr. — 2012-12-15