telnet通过smtp发送邮件

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////////////////////////////////////CMD指令//////////////////////////////////////////////
cmd
telnet smtp.163.com 25   or   telnet smtp.exmail.163.com 25
220 163.com Anti-spam GT for Coremail System (163com[20141201])
helo 163.com
250 OK
auth login
334 dXNlcm5hbWU6
MTg3MDI2MjMzNzVAMTYzLmNvbQ==
334 UGFzc3dvcmQ6
eWtqQDUyMDE0MTMq
235 Authentication successful
mail from:<[email protected]>
250 Mail OK
rcpt to:<[email protected]>
250 Mail OK
data
354 End data with <CR><LF>.<CR><LF>
from:18702623375
to:18702623375
subject:pldg
pldg
pldg
.
250 Mail OK queued as smtp5,D9GowAC331V6+KxZ1bf_AA--.252S2 1504508205

///////////////////////////////////网上资料/////////////////////////////////////////////////////

今天无意在一个论坛看到别人发帖用TELNET连接发信服务器可以伪造发信人地址，就仔细看了一下如何使用TELNET来发送邮件
我测试了一下163和QQ都成功发送了，但是伪造地址不行，这文章也不是重点说那个啊。。。。
首先要把登陆邮箱的用户名和密码用BASE64加密
可以用这个网站在线加密http://tool.chinaz.com/Tools/base64.aspx
然后
telnet smtp.qq.com 25
开始输入
helo xiaoyu
auth login
eGlhb3l1（加密后的用户名xiaoyu）
eGlhb3l1（加密后的密码xiaoyu）
mail from:<[email protected]>
rcpt to:<[email protected]>
data
From:[email protected]
To:[email protected]
Subject:test
【空行】
test
【空行】
.(最后这个小数点一定要加上，以下是效果图)
//////////////////////////////////////////WIF发送AT指令//////////////////////////////////////
AT
AT+CWMODE=1
//AT+RST
AT+CWJAP="chuanxi_2.4G_104","jxau2017"
AT+CIPMUX=0
AT+CIPSTART="TCP","220.181.12.16",25
AT+CIPMODE=1
AT+CIPSEND
helo 163.com
auth login
MTg3MDI2MjMzNzVAMTYzLmNvbQ==【base64 邮箱账号编码】
eWtqQDUyMDE0MTMq【base64 邮箱密码编码】
mail from:<[email protected]>
rcpt to:<[email protected]>
data
from:18702623375
to:18702623375
subject:pldgdgdg safafsff.
【空行】
pugai
【空行】
.
//////////////////////////////////////////////试验验证//////////////////////////////////////////////////////
AT

OK
WIFI CONNECTED
AT+CWMODE=1

OK
AT+CWJAP="chuanxi_2.4G_104","jxau2017"

WIFI DISCONNECT
AT+CWJAP="chuanxi_2.4G_104","jxau2017"

busy p...
WIFI CONNECTED
AT+CIPMUX=0

busy p...
WIFI GOT IP

OK
AT+CIPSTART="TCP","220.181.12.16",25

ERROR
CLOSED
AT+CIPSTART="TCP","220.181.12.16",25

ERROR
CLOSED
AT+RST

OK
WIFI DISCONNECT

 ets Jan  8 2013,rst cause:2, boot mode:(3,0)

load 0x40100000, len 1856, room 16
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8
tail 0
chksum 0x79
csum 0x79

2nd boot version : 1.5
  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

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Ai-Thinker Technology Co. Ltd.

ready
AT+CIPSTART="TCP","220.181.12.16",25

no ip

ERROR
WIFI CONNECTED
WIFI GOT IP
helo 163.com

ERROR
AT+CIPMODE=1

OK
AT+CIPSEND

ERROR
AT+CIPSEND

ERROR
AT+CIPSEND

ERROR
AT+CIPMODE=1

OK
AT+CIPSEND

ERROR
AT

OK
AT+CWMODE=1

OK
AT+CWJAP="chuanxi_2.4G_104","jxau2017"

OK
AT+CIPMUX=0

OK
AT+CIPSTART="TCP","220.181.12.16",25

ERROR
CLOSED
AT+CIPSTART="TCP","220.181.12.16",25

CONNECT

OK
220 163.com Anti-spam GT for Coremail System (163com[20141201])
AT+CIPMODE=1

OK
AT+CIPSEND

OK

>250 OK
334 dXNlcm5hbWU6
334 UGFzc3dvcmQ6
235 Authentication successful
250 Mail OK
250 Mail OK
354 End data with <CR><LF>.<CR><LF>
250 Mail OK queued as smtp12,EMCowACXz2+NGq1ZX8yMFw--.29116S2 1504516787