There is another case where the reverse DNS lookup is required.
还有另一种情况，其中必须进行反向DNS 搜索。
Reverse DNS lookup is using an Internet IP address to find a domain name.
反向域名系统(DNS)查找是指使用互联网IP地址来查找域名。
Reverse DNS Lookup verifies the DNS record for the sending servers IP address.
反向解析dns登记检讨邮件发送服务器IP地址。
To enable this, you must configure both a forward lookup zone and a reverse lookup zone in the Windows DNS.
为此，必须在WindowsDNS中配置一个正向查找区域和一个反向查找区域。
A reverse lookup record for the server, also known as a PTR resource record, is registered in a reverse lookup zone in the DNS database.
服务器的反向查找记录(也称为PTR资源记录)在DNS数据库的反向查找区域中注册。
A reverse lookup record for the server, also known as a PTR resource record, is registered in a reverse lookup zone in the DNS database.
服务器的反向查找记录(也称为PTR资源记录)在DNS数据库的反向查找区域中注册。
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