这里需要说明的是,在(zài )我们系统(tǒng )里(lǐ )面如(rú )果单独(dú )设置一个子(zǐ )域名解析,比如(rú )将(jiāng )主机(jī )名设置(zhì )为mail,单独解析到(dào )9,那(nà )么该(gāi )解析(xī )记录优(yōu )先泛域名(míng )在(zài )实际使(shǐ )用中(zhōng )作用是非常广(guǎng )泛的,比如实现无(wú )限(xiàn )二级(jí )域名功(gōng )能,提供(gòng )免(miǎn )费的(de )url转(zhuǎn )发,在
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