nc smtp.163.com 25 22:06:13
220 163.com Anti-spam GT for Coremail System (163com[20141201])
helo hello
250 OK
auth login
334 dXNlcm5hbWU6
MTgzNaubYjYzOTJAMTYzLmNvbQ==
334 UGFzc3dvcmQ6
enpookmoenpo
235 Authentication successful
mail from: <[email protected]>
250 Mail OK
rcpt to: <[email protected]>
250 Mail OK
data
354 End data with <CR><LF>.<CR><LF>
subject: hello mail
from: [email protected]
to: [email protected]

hell world
.
250 Mail OK queued as smtp5,D9GowAD3fvO_diJbYMcYBw--.1783S2 1528985394
quit
221 Bye