Clue: Drops in the letter box

Answer: MAILS

Length: 5

---

Similar Clues:

• Today, I tried to put a self-effacing three-letter acronym inside each theme entry. Turns out it works in any order except the one I want. ___ (FML with 3 letters)
• The pairs of letters inserted into each of this puzzle's theme answers, for example (FASHIONMONOGRAM with 15 letters)
• Internet letters, and a hint to this puzzle's theme (WWW with 3 letters)
• Initial Hebrew letter (ALEPH with 5 letters)
• Mil. letter drops (APOS with 4 letters)
• G.I. letter-drops (APOS with 4 letters)
• Informal letter signoff (BEST with 4 letters)
• Informal letter closing (BEST with 4 letters)
• Letter upon which this puzzle's theme is built (CEE with 3 letters)
• Letter switched to ess in this puzzle's theme (CEE with 3 letters)