SMTP dan POP command via Telnet:

1. SMTP

 > telnet [smtp server] 25
helo a
mail from: [alamat email pengirim]
rcpt to: [alamat email tujuan]
data
subject: [subject]
[body email]
.                          // type a "dot" at this point
quit

2. POP

 > telnet [pop server] 110
user [username]
pass [password]
stat                     #melihat isi mailbox
retr [no]              #no=no email yg diinginkan utk diambil, berdasarkan command 'stat'
dele [no]              #menghapus no email tertentu
quit