这里需要说明的是,在(zài )我们系(xì )统里面如(rú )果单独(dú )设置一(yī )个(gè )子域名(míng )解析(xī ),比如(rú )将主(zhǔ )机(jī )名(míng )设(shè )置(zhì )为mail,单独解析到9,那(nà )么该解析记录优(yōu )先泛域名在实际使用(yòng )中作(zuò )用是(shì )非常(cháng )广(guǎng )泛的,比如实现(xiàn )无限(xiàn )二(èr )级(jí )域名功能(néng ),提(tí )供免费的url转发(fā ),在
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