cmd+win打开命令行，
telnet smtp.qq.com 587
EHLO smtp.qq.com
STARTTLS
AUTH LOGIN
输入用户名...
输入密码...
MAIL FROM: <123123123@qq.com>
RCPT TO: <123123123@qq.com>
DATA
From: xxx@xx.com
To: xxxxx@xx.com
Subject: zhuti
Date: Tue, .....
testset
etet
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