如何防止垃圾邮件

1、使用SMTP filter,以email地址过滤（ex:tony@domain.com,、*@domain.com)；过滤掉发件人是空白的邮件。
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避免太多的NDR造成太多的Queue！
去掉“Allow non-delivery reports”前面的勾！

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限制IP和domian connection


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