手紙の末文に感謝の言葉を書き添えた。
I added a few words of thanks in the closing lines of the letter.
末文には「まずは取り急ぎご報告まで」などの決まり文句がよく使われる。
Set phrases such as "This is just a quick report for now" are often used in the closing lines.
手紙は前文、主文、末文、後付けの順に書くのが基本だ。
A letter is basically written with the opening, the main text, the closing lines, and the date, signature and addressee, in that order.