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如果你的IP地址只有一个，并且有很多域名同时指向这个IP地址。却要想利用这些域名来收发不同的信件时，需要从两方面来解决这个问题：1）域名解析技术：如果你的主域名是domain.com，其他分域名是domain1.com or domain2.com等。第一，先解析domain.com，将domain.com及www.do
If your IP address is only one, and there are many domain names at the same time point to this IP address. But want to use these domains to send and receive different letters, you need to solve this problem from two aspects: 1) Domain Name Resolution Technology: If your main domain is domain.com, other sub-domain name is domain1.com or domain2.com, etc. . First, parse domain.com first, domain.com and www.do.com