这里需要说明的是(shì ),在(zài )我们系统(tǒng )里面(miàn )如果(guǒ )单(dān )独设置一(yī )个子域名解析(xī ),比如将(jiāng )主机(jī )名设置为mail,单(dān )独解析(xī )到(dào )9,那么该解析记录优先泛域名(míng )在实(shí )际使用中(zhōng )作用(yòng )是非常广泛的,比(bǐ )如(rú )实(shí )现无(wú )限(xiàn )二级域名功(gōng )能,提供(gòng )免(miǎn )费的(de )url转发(fā ),在
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