【转载】使用TELNET手工操作 SMTP/POP 收发邮件

说明：手工录入的用蓝色字体表示，#后的为注释，不可录入。

=========先计算BASE64编码的用户名密码，认证登录需要用到===========
[crazywill@localhost crazywill]$ perl -MMIME::Base64 -e 'print encode_base64("crazywill");'
Y3Jhenl3aWxs

[crazywill@localhost crazywill]$ perl -MMIME::Base64 -e 'print encode_base64("mypassword");'
bXlwYXNzd29yZA==

======================开始SMTP发信操作==========================

[crazywill@localhost crazywill]$ telnet smtp.163.com 25              #telnet登录25端口
Trying 202.108.5.81...
Connected to smtp.163.com.
Escape character is '^]'.
220 163.com Coremail SMTP(Anti Spam) System
EHLO smtp.163.com                                                           # 握手 :)
250-mail
250-PIPELINING
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250 8BITMIME
AUTH LOGIN                                                                    # 开始认证登录
334 dXNlcm5hbWU6
crazywill
334 UGFzc3dvcmQ6
mypassword
535 Error: authentication failed                                       # 直接用户名密码不能登录
AUTH LOGIN
334 dXNlcm5hbWU6
Y3Jhenl3aWxs
334 UGFzc3dvcmQ6
bXlwYXNzd29yZA==
235 Authentication successful                                      # 使用Base64编码则成功登录
MAIL FROM:<>                                     # 邮件发送方
553 You are not authorized to send mail, authentication is required          # 不可伪造发送邮件 
MAIL FROM:<>                            # 邮件发送方
250 Mail OK
RCPT TO:<>                                   # 邮件的接收方，若有多个收件人，则重复这一语句多次。
250 Mail OK
DATA                                                                               # 邮件体内容
354 Please start mail input.
TO:                                 # 此处的TO，FROM，等内容，可以随便造假 :)  可以骗人但骗不了懂得查看邮件源码的。
FROM:
SUBJECT: test by telnet/smtp

test, just a test.                                             # 邮件正文内容，与Header部分空一行开始写
.                                                                       # 邮件写完，以一个句点加回车结果。
250 Mail OK queued as smtp10,wKjADQ2ApxRnnqBE0CWaEw==.38326S3                 # 返回250 表示发送成功。
NOOP                                                            # 空语句，不执行任何操作，一般用来保持和服务器连接，不要掉线
250 OK
QUIT                                                            # 退出
221 Closing connection. Good bye.
Connection closed by foreign host.
[crazywill@localhost crazywill]$


======================开始POP3收信操作==========================

[crazywill@localhost crazywill]$ telnet pop.163.com 110                #telnet登录110端口
Trying 202.108.5.104...
Connected to pop.163.com.
Escape character is '^]'.
+OK Welcome to coremail Mail Pop3 Server (163com[20050206])
USER crazywill                                                     # 用户名
+OK core mail
PASS mypassword                                             # 登录密码
+OK 254 message(s) [27676669 byte(s)]
STAT                                                                      # 查看邮箱状态
+OK 254 27676669
LIST                                                                         # 邮件列表
+OK 254 27676669
1 2468
2 21945
3 33136
4 2071
5 3364
6 18906
7 3136
8 24764
.................

TOP 254  0                                                    # 查看指定邮件的邮件头，0表示查看整个邮件头，其它正整数表示限制返回多少行。
+OK core mail
Received: from smtp.63.com (unknown [58.252.70.158])
        by smtp5 (Coremail) with SMTP id wKjREDrA9gIfFqlEjCnRAg==.29062S4;
        Mon, 03 Jul 2006 21:07:18 +0800 (CST)
TO:
FROM :                                                    # 这里即前面发信时伪造的一个假发送人信息，平时正常操作只显示这个。
SUBJECT: test by telnet/smtp                                        # 邮件主题
Message-Id: <44A91687.0E6F6C.07562>
Date: Mon, 3 Jul 2006 21:07:19 +0800 (CST)
Sender:                                             # 这里是真正的发送人，不可伪造。

.
RETR 254                                                     # 获取指定邮件
+OK 354 octets
Received: from smtp.63.com (unknown [58.252.70.158])
        by smtp5 (Coremail) with SMTP id wKjREDrA9gIfFqlEjCnRAg==.29062S4;
        Mon, 03 Jul 2006 21:07:18 +0800 (CST)
TO:
FROM :
SUBJECT: test by telnet/smtp
Message-Id: <44A91687.0E6F6C.07562>
Date: Mon, 3 Jul 2006 21:07:19 +0800 (CST)
Sender:

test, just a test.
.

DELE 254                                                       # 删除第254封邮件
+OK core mail
STAT                                                             # 查看邮箱状态
+OK 253 27676315
QUIT                                                              # 退出
+OK core mail
Connection closed by foreign host.
[crazywill@localhost crazywill]$


===============================================================

QUESTION:
如何发送给多人，如何CC，BCC？

ANSWER: (此答案由SnifferPro监听OUTLOOK发送多人邮件分析出来的)
同一封信发送/抄送给多人，在MAIL FROM:<...> 后，多次使用 RCPT TO:<...>
每次一个邮件地址，需要发给多少人就 RCPT TO 多少次。

在DATA里面写的CC，BCC，TO，等信息只起显示作用，与实际发送人接收人无关。

CC与BCC的差别：同样都是RCPT TO指定收件人，但是邮件客户端程序，不会将BCC的收件人写到DATA要传送的数据里。