一、smtp邮件发送
需要熟悉smtp的常用命令。用户名和密码是base64加密，163邮箱开启授权码服务后，使用授权码登录。
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
helo 163.com #握手
250 OK
auth login # 开始认证登录
334 dXNlcm5hbWU6
aGVsbG9lcnJvckAxNjMuY29t #用户名，密码，都是base64 加密
334 UGFzc3dvcmQ6
asdfaasdfasdf
235 Authentication successful
mail from: <[email protected]> #发送方，注意“：”后面的 一个空格
250 Mail OK
rcpt to: <[email protected]> #接收方，注意“：”后面的 两个 空格
250 Mail OK
rcpt to: <[email protected]> #接收方可多个
250 Mail OK
data #邮件数据
354 Please start mail input.
from:<[email protected]> #可写任意
to:<[email protected]>
subject:test #主题
#空行
this is a test mail. #正文
#空行
. #结尾
250 Mail queued for delivery.
noop #保活
250 OK
quit #退出
221 Closing connection. Good bye.
二、IMAP接收邮件
telnet smtp.163.com 143 #telnet登录IMAP协议的143端口
Trying 192.168.0.1...
Connected to xxxxxx
Escape character is '^]'.
* OK xxxxxxx System IMap Server Ready
A01 login [email protected] yourmima #登录
A01 OK LOGIN completed
A02 LIST "" * #查看信箱列表
* LIST () "/" "INBOX"
* LIST (\Drafts) "/" "&g0l6P3ux-"
* LIST (\Sent) "/" "&XfJT0ZAB-"
* LIST (\Trash) "/" "&XfJSIJZk-"
* LIST (\Junk) "/" "&V4NXPpCuTvY-"
* LIST () "/" "&dcVr0mWHTvZZOQ-"
* LIST () "/" "&Xn9USpCuTvY-"
* LIST () "/" "&i6KWBZCuTvY-"
* LIST () "/" "&Y6hef5CuTvY-"
A02 OK LIST Completed
A03 Select INBOX #选择收信箱操作
* 7 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1] UIDs valid
* FLAGS (\Answered \Seen \Deleted \Draft \Flagged)
* OK [PERMANENTFLAGS (\Answered \Seen \Deleted \Draft \Flagged)] Limited
A03 OK [READ-WRITE] SELECT completed
A04 Search ALL #查看收信箱所有邮件，列出符合条件的邮件序号(ALL表示列出当前信箱INBOX中的所有邮件)
* SEARCH 1 2 3 4 5 6 7
A04 OK SEARCH completed
A05 Search new #查询收件箱所有新邮件
* SEARCH
A05 OK SEARCH completed
A06 Fetch 7 full #获取第7封邮件的邮件头
* 7 FETCH (INTERNALDATE " 8-May-2018 00:12:08 +0800" FLAGS (\Seen) ENVELOPE ("Tue, 8 May 2018 00:12:08 +0800 (CST)" "=?UTF-8?B?572R5piT6YKu566x5o+Q6YaS77ya5LiA5qyh6KKr6Zi75q2i55qE5pS25L+h6KGM5Li6?=" (("=?UTF-8?B?572R5piT6YKu5Lu25Lit5b+D?=" NIL "mail" "service.netease.com")) ((NIL NIL "mail" "service.netease.com")) (("=?UTF-8?B?572R5piT6YKu5Lu25Lit5b+D?=" NIL "mail" "service.netease.com")) (("=?UTF-8?B?ImhlbGxvZXJyb3JAMTYzLmNvbSI=?=" NIL "helloerror" "163.com")) NIL NIL NIL "<1802364245.6230098.1525709528851.JavaMail.mail@service.netease.com>") BODY ("text" "html" ("charset" "UTF-8") NIL NIL "quoted-printable" 4403 123) RFC822.SIZE 5402)
A06 OK Fetch completed
A07 FETCH 7 rfc822 #获取第7封邮件的邮件内容
* 7 FETCH (RFC822 {5402}
Received: from edm_common_593084_313232 (unknown [192.168.206.156])
by mfast9 (Coremail) with SMTP id uMCowECpXOLYevBasQRjGA--.2760S2;
Tue, 08 May 2018 00:12:08 +0800 (CST)
From: =?UTF-8?B?572R5piT6YKu5Lu25Lit5b+D?= <[email protected]>
Sender: [email protected]
To: "[email protected]" <[email protected]>
Message-ID: <1802364245.6230098.1525709528851.JavaMail.mail@service.netease.com>
Subject: =?UTF-8?B?572R5piT6YKu566x5o+Q6YaS77ya5LiA?=
=?UTF-8?B?5qyh6KKr6Zi75q2i55qE5pS25L+h6KGM5Li6?=
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
X-Netease-Folder: INBOX
X-NETEASE-FLAG: cHJvZD1lZG0mdHlwZT1jb21tb24maWlkPTU5MzA4NCZkaWQ9MzEzMjMy
X-CM-TRANSID:uMCowECpXOLYevBasQRjGA--.2760S2
X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUYLfJ529EdanIXcx71UUUUU7v73
VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73eTB2vfuFKfJI43ZEXa7xR_UUUUUUUUU=
=
X-Originating-IP: [192.168.206.156]
Date: Tue, 8 May 2018 00:12:08 +0800 (CST)
<meta charset=3D"UTF-8" />
.....省略....
)
A07 OK Fetch completed
A08 Fetch 5 flags #查询第5封邮件的标志位
* 5 FETCH (FLAGS (\Seen))
A08 OK Fetch completed
A09 Store 5 +flags.silent (\deleted) #设置标志位为删除，结尾有空格，命令错误
A09 BAD Request not ending with
A09 Store 5 +flags.silent (\deleted) #设置标志位为删除
* 5 EXPUNGE
* 6 EXISTS
* 0 RECENT
A09 OK STORE completed
A10 Fetch 5 flags
* 5 FETCH (FLAGS (\Seen))
A10 OK Fetch completed
A11 Expunge #永久删除当前邮箱INBOX中所有设置了\deleted标志的信件
A11 OK EXPUNGE completed
A12 Fetch 5 flags
* 5 FETCH (FLAGS (\Seen))
A12 OK Fetch completed
A13 search all #还有6封邮件
* SEARCH 1 2 3 4 5 6
A13 OK SEARCH completed
A14 noop #连接持续
A14 OK NOOP completed #连接持续
A14 logout #退出
* BYE IMAP4rev1 Server logging out
A14 OK LOGOUT completed
三、POP接收邮件
telnet pop.163.com 110 #telnet登录110端口 使用SCRT更好
Trying 202.108.5.104...
Connected to pop.163.com.
Escape character is '^]'.
+OK Welcome to coremail Mail Pop3 Server (163com[20050206])
user [email protected] #用户名
+OK core mail
pass yourmima #密码
+OK 94 message(s) [6532994 byte(s)] # 94封邮件，6532994字节大小
stat # 查看邮箱状态
+OK 94 6532994
list # 邮件列表
+OK 94 6532994
1 9532
2 18209
...
94 3303
.
top 94 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 3303 octets
Received: from mail163 (unknown [10.110.4.76])
by mfast8 (Coremail) with SMTP id t8CowEAZHm1SdvBaLFzCCg--.13649S2;
Mon, 07 May 2018 23:52:50 +0800 (CST)
From: =?UTF-8?B?572R5piT6YKu5Lu25Lit5b+D?= <[email protected]>
Sender: [email protected] # 这里是真正的发送人，不可伪造。
To: helloerror <[email protected]>
Message-ID: <1469032237.2462365.1525708370207.JavaMail.mail@service.netease.com>
Subject: =?UTF-8?B?6YKu5Lu25bey6KKr5a6i5oi356uv5oiQ5Yqf?=
=?UTF-8?B?5pS25Y+W5bm25Zyo5pyN5Yqh5Zmo5LiK5Yig6Zmk?=
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
X-CM-TRANSID:t8CowEAZHm1SdvBaLFzCCg--.13649S2
X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73
VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvj4RJUUUUUUUU
X-Originating-IP: [10.110.4.76]
Date: Mon, 7 May 2018 23:52:50 +0800 (CST)
.
top 94 1 # 头后面，再多获取一行
+OK 3303 octets
Received: from mail163 (unknown [10.110.4.76])
by mfast8 (Coremail) with SMTP id t8CowEAZHm1SdvBaLFzCCg--.13649S2;
Mon, 07 May 2018 23:52:50 +0800 (CST)
From: =?UTF-8?B?572R5piT6YKu5Lu25Lit5b+D?= <[email protected]>
Sender: [email protected]
To: helloerror <[email protected]>
Message-ID: <1469032237.2462365.1525708370207.JavaMail.mail@service.netease.com>
Subject: =?UTF-8?B?6YKu5Lu25bey6KKr5a6i5oi356uv5oiQ5Yqf?=
=?UTF-8?B?5pS25Y+W5bm25Zyo5pyN5Yqh5Zmo5LiK5Yig6Zmk?=
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
X-CM-TRANSID:t8CowEAZHm1SdvBaLFzCCg--.13649S2
X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73
VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvj4RJUUUUUUUU
X-Originating-IP: [10.110.4.76]
Date: Mon, 7 May 2018 23:52:50 +0800 (CST)
<HTML><BODY><TABLE width=3D"608" border=3D"0" align=3D"center" cellpadding=
.
retr 94 # 获取指定邮件
+OK 3303 octets
Received: from mail163 (unknown [10.110.4.76])
...
Date: Mon, 7 May 2018 23:52:50 +0800 (CST)
<HTML><BODY><TABLE width=3D"608" border=3D"0" align=3D"center" cellpadding=
...
</BODY></HTML>
.
dele 94 # 删除指定邮件
+OK core mail
quit # 退出
+OK core mail
至此完成了邮件的收发操作
四、其它说明
1、 如何发送给多人？
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。
2.如何CC，BCC？
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。