news; tidings; correspondence — information or messages received by letter/email; also used as a suffix as in '〜dayori'.
久しぶりに母から便りが届いた。
I received news from my mother for the first time in a while.
季節の便りとして桜の写真を送った。
I sent photos of the cherry blossoms as a seasonal greeting.
卒業生便りに近況を書いて投稿した。
I wrote an update about my recent situation and submitted it to the alumni newsletter.