Crossword puzzle clue "they send out letters"

They send out letters

Letters you push a button to send

Letters teachers send to colleges, informally

Worrisome letters to send

Send letters?

Send flowers and love letters, say

"The ___ and Alize keep me pissy / Girls used to diss me / Now they write letters 'cause they miss me" (Notorious B.I.G. lyric name-checking his fancy champagne diet)

Letters the Bluths put on the invitation to a fundraiser they couldn't think of a good cause for, which eventually became the fake disease they used to pocket all the donation money, on "Arrested Deve