Telnet邮件服务器发送邮件

下面的例子是用139的smtp服务器

telnet smtp.139.com 25     //telnet到smtp端口
Trying 120.232.169.42...
Connected to smtp.139.com.
Escape character is '^]'.
220 localhost richmail system v10(2f176279184726f-809c0) //服务器返回220
helo mytest     //跟服务器打招呼
250 localhost richmail system v10(2f176279184726f-809c0)  //服务器返回250
auth login    //登录
334 dXNlcm5hbWU6 //服务器返回334
*** //*此处输入base64编码后的qq邮箱名*/
334 UGFzc3dvcmQ6 //服务器返回334
*** //*此处输入base64编码后的授权码*/
235 Authentication successful  //登录成功
mail from: <kfwtry@139.com>  //发件邮箱
250 ok
rcpt to: <lp459rh@qq.com>  //收件邮箱
250 ok
data    //开始写信
354 end with .
to:hello    //邮件收件人的名称
from:mytest    //邮件来源名称
subject: this is a test telnet smtp mail    //邮件标题
hello,my friend        //消息内容
  This is a test mail form 139.com       //消息内容
.   //英文的点，邮件结束标志。即刻发送

 Base64在线编码/解码  https://base64.us/