这里需要(yào )说明(míng )的(de )是,在(zài )我们(men )系统里面(miàn )如(rú )果单独设置一个子域(yù )名(míng )解(jiě )析(xī ),比(bǐ )如将(jiāng )主机名(míng )设(shè )置为mail,单独(dú )解析到(dào )9,那么该解析记录优(yōu )先泛域名(míng )在实(shí )际(jì )使(shǐ )用中作用是非(fēi )常广泛的,比如实现(xiàn )无限(xiàn )二级域名功能,提供(gòng )免费的url转发(fā ),在
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