telnetでメールを送信してみる

$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 unko
ehlo unko
250-nai.homelinux.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-AUTH NTLM LOGIN PLAIN DIGEST-MD5 CRAM-MD5
250-AUTH=NTLM LOGIN PLAIN DIGEST-MD5 CRAM-MD5
250 8BITMIME
mail from:<test@nai.homelinux.net>
250 Ok
rcpt to:<root@nai.homelinux.net>
250 Ok
data
354 End data with <CR><LF>.<CR><LF>
subject:test mail
from:test@nai.homelinux.net
to:root@nai.homelinux.net
this is test mail
.
250 Ok: queued as CC8E3242EE5
quit
221 Bye
Connection closed by foreign host