这里(lǐ )需要说(shuō )明的是,在我(wǒ )们系(xì )统里面如(rú )果单独设(shè )置一(yī )个子域(yù )名(míng )解析,比如将(jiāng )主机(jī )名设置(zhì )为mail,单独解(jiě )析到(dào )9,那么该解析(xī )记录优先泛域名(míng )在实际使用(yòng )中作(zuò )用(yòng )是非(fēi )常(cháng )广(guǎng )泛的(de ),比如实现无限二级域名功能,提供免(miǎn )费的(de )url转发(fā ),在
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