snail mail
US /ˈsneɪl meɪl/
UK /ˈsneɪl meɪl/

1.
correio normal, correio de caracol
the regular postal service, as opposed to email or other electronic communication
:
•
I sent the documents via snail mail, so they might take a few days to arrive.
Enviei os documentos por correio normal, então pode demorar alguns dias para chegarem.
•
Even in the age of email, some people still prefer to send invitations by snail mail.
Mesmo na era do e-mail, algumas pessoas ainda preferem enviar convites por correio normal.