这里需要说明的是,在我(wǒ )们系(xì )统里面如(rú )果(guǒ )单独(dú )设置一(yī )个子域名(míng )解析,比(bǐ )如将(jiāng )主机名设(shè )置为mail,单(dān )独(dú )解析到9,那(nà )么该(gāi )解析(xī )记录(lù )优先泛(fàn )域名在(zài )实(shí )际使用(yòng )中作用(yòng )是非(fēi )常(cháng )广泛的,比如(rú )实现(xiàn )无限二级(jí )域名功能,提供免费的url转(zhuǎn )发,在
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