telnet mail.xxx.com 25
HELO mail.xxx.com
MAIL FROM:sender@xxx.com
RCPT TO: recver@xxx.com
DATA
Subject: =?utf-8?B?6YKu5Lu25rWL6K+V?=
From: "sender" <sender@xxx.com>
To: "recver" <recver@xxx.com>
MIME-Version: 1.0
Content-Type: text/html;
Content-Transfer-Encoding: 8bit
<html>
<head>
<title>Title of page</title>
</head>
<body>
<b>mail<b>
</body>
</html>
.
=========ESMTP============
参考【http://blog.csdn.net/hsstc/article/details/8936066】
本人测试用的是HW内网的mail.huawei.com
-> 符号代表一个回车，即一次发送
本测试邮件发送发送的是一个加粗的字体
telnet mail.huawei.com 25 ->
EHLO mail.huawei.com ->
AUTH LOGIN ->
YzAwMTgyMzg5 ->
QzM4OS5DT00= ->
MAIL FROM:sender@xxx.com ->
RCPT TO: recver@xxx.com ->
DATA ->
Subject: =?utf-8?B?6YKu5Lu25rWL6K+V?=
From: "sender" <sender@xxx.com>
To: "recv" <recv@xxx.com>
MIME-Version: 1.0
Content-Type: text/html;
Content-Transfer-Encoding: 8bit
<html>
<head>
<title>Title of page</title>
</head>
<body>
<b>mail<b>
</body>
</html>
.
->
quit ->
============SMTP-关于邮件编码的格式 ==============
http://blog.csdn.net/ljmwork/article/details/7871694
最近接触到网易的闪电邮客户端程序，发现它发邮件时，标题的编码方式与Foxmail不一样，如：
网易闪电邮：Subject: =?utf-8?B?6YKu5Lu25rWL6K+V?=
Foxmail： Subject: =?gbk?B?08q8/rLiytQ=?=
从网上收集了一些这方面的一些资源，整理如下：
邮件编码分了3段，=?和?=是开始和结束标记，中间的问号是间隔符
第一段：utf-8或者gbk，表示原来页面的编码方式
第二段：B是表示邮件的编码方式为base64
第三段：08q8/rLiytQ= 或者 6YKu5Lu25rWL6K+V 表示标题的内容，但是经过Base64编码了
================
/**
* BASE64编码 来自CSDN某个人公布，版权未知
*/
const unsigned char BASE64_PADDING='='; //输入数据不足3的倍数时输出字符后面填充'='号
const unsigned char BASE64_CODE[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
//使用64字节的表
void base64_encode(const void* pdata,const unsigned long data_size,void* out_pcode)
{
const unsigned char* input=(const unsigned char*)pdata;
const unsigned char* input_end=&input[data_size];
unsigned char* output=(unsigned char*)out_pcode;
for(;input+2<input_end;input+=3,output+=4)
{
output[0]=BASE64_CODE[ input[0] >> 2 ];
output[1]=BASE64_CODE[ ((input[0] << 4) | (input[1] >> 4)) & 0x3F];
output[2]=BASE64_CODE[ ((input[1] << 2) | (input[2] >> 6)) & 0x3F ];
output[3]=BASE64_CODE[ input[2] & 0x3F];
}
unsigned long bord_width=input_end-input;
if (bord_width==1)
{
output[0]=BASE64_CODE[ input[0] >> 2 ];
output[1]=BASE64_CODE[ (input[0] << 4) & 0x3F ];
output[2]=BASE64_PADDING;
output[3]=BASE64_PADDING;
}
else if (bord_width==2)
{
output[0]=BASE64_CODE[ input[0] >> 2 ];
output[1]=BASE64_CODE[ ((input[0] << 4) | (input[1] >> 4)) & 0x3F ];
output[2]=BASE64_CODE[ (input[1] << 2) & 0x3F ];
output[3]=BASE64_PADDING;
}
}