这(zhè )里需要(yào )说明的是(shì ),在我们系统(tǒng )里面如果(guǒ )单独(dú )设置(zhì )一(yī )个子域名解析,比(bǐ )如(rú )将主机(jī )名设置(zhì )为mail,单独解析(xī )到(dào )9,那(nà )么该解析(xī )记(jì )录优先泛域名在实(shí )际使(shǐ )用(yòng )中作用是(shì )非常(cháng )广泛的,比如实现无(wú )限二(èr )级(jí )域名功能,提供免费的url转发,在
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