Sudoku – Mailboxes

Give the grey cells a workout with this special version of Sudoku using letters instead of numbers. The rules are the same, each row, column and 3×3 square box must contain each of the letters in the keyword exactly once.
We have filled in some of the solution to give you a start.
Your keyword describes products everyone should have at this festive time of year “MAILBOXES” for the Christmas post.

Answers next week!