win7下指令发送email:(telnet：不为内部指令时控制面板 -> 程序和功能 -> 打开或关闭Windows功能，如下“telnet客户端”)
telnet smtp.sina.com 25
ehlo sushicai_xinlang
auth login
c3VzaGljYWlfeGlubGFuZw==
YWRhaXN1c3UxMzE0
mail from:<sushicai_xinlang@sina.com>
rcpt to:<356494994@qq.com>
data
from:<sushicai_xinlang@sina.com>
subject:haha
test!!!
.
quit