Mine
public text v1 · immutable$ nc mail.e-cards.sk 25
220 JOHN Smtp Server
helo mail.me
250 mail.odyseusteam.sk
mail from: test@test.com
250 2.1.0 Ok
rcpt to: postmaster@e-cards.sk
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
hello there. I am sending you mail.
.
250 2.0.0 Ok: queued as AC68410F782