错误描述：
使用163邮箱发送邮件的功能时，后台报错
553 authentication is required,smtp3,DdGowEDJuUGnoVZWtkIPAA--.5044S2 1448518056
错误原因：
authentication is required
需要验证。才能连接到smtpServer !
1: 查看你所连接的服务器是否 开通了
邮箱设置中是否设置POP3/SMTP/IMAP
2: 查看你的用户名，密码,端口是否正确
POP3服务器:pop.163.com
SMTP服务器:smtp.163.com
IMAP服务器:imap.163.com
host=smtp.163.com
password=******
3: 查看 props.setProperty("mail.smtp.auth", "true");
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