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ポストに入れた

put it in the mailbox

→ ポスト
phrase Rare #39,158
put it in the mailbox ポスト means a mailbox for sending mail in this context. The phrase describes putting something into it, not necessarily mailing it directly at a post office.
JA: 手紙をポストに入れた。
EN: I put the letter in the mailbox.