at the post office; in the mail
Tom está no correio.
Tom is at the post office.
Let's stop by the post office.
I've already been to the post office.
Ainda não tive tempo de passar no correio.
I haven't had time to stop by the post office yet.
— Central do Brasil (1998)
Ele está no lugar errado, no correio polonês.
He is in the wrong place, at the Polish post office.
— O Tambor (1979)
E dois se quiser que a gente bote no correio.
And two if you'd like us to mail it.
— Central do Brasil (1998)