email协议之：POP3协议
POP3:用于从POP服务器检索邮箱中的邮件，POP3服务器通过监听TCP110端口来启动POP服务。同样在LINUX中使用TELNET,IP,端口110，命令总结及SESSION过程如下：
POP3 Commands:
USER name valid in the AUTHORIZATION state
PASS string
QUIT
STAT valid in the TRANSACTION state
LIST
RETR msg
DELE msg
NOOP
RSET
QUIT
SESSION 过程：
S:
C:
S: +OK POP3 server ready <1896.697170952@dbc.mtview.ca.us>
C: APOP mrose c4c9334bac560ecc979e58001b3e22fb
S: +OK mrose's maildrop has 2 messages (320 octets)
C: STAT
S: +OK 2 320
C: LIST
S: +OK 2 messages (320 octets)
S: 1 120
S: 2 200
S: .
C: RETR 1
S: +OK 120 octets
S:
S: .
C: DELE 1
S: +OK message 1 deleted
C: RETR 2
S: +OK 200 octets
S:
S: .
C: DELE 2
S: +OK message 2 deleted
C: QUIT
S: +OK dewey POP3 server signing off (maildrop empty)
C:
S:
具体的命令以后有时间写写，具体参考RFC1939吧
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