$ nc -v kpf.mruni.lt 25
Connection to kpf.mruni.lt 25 port [tcp/smtp] succeeded!
220 policija.kpf.mruni.lt ESMTP Exim 4.50 Mon, 15 Oct 2007 21:18:55 +0300
helo mail.com
250 policija.kpf.mruni.lt Hello gateway.bsd.lt [212.59.24.71]
mail from: user@mail.com
250 OK
rcpt to: foo@kpf.mruni.lt
250 Accepted
data
354 Enter message, ending with "." on a line by itself
test mail.
.
250 OK id=1IhUXE-0001F8-Ha