这里需要(yào )说(shuō )明的(de )是,在我(wǒ )们系(xì )统(tǒng )里面(miàn )如(rú )果单独设置(zhì )一个(gè )子域名解析(xī ),比如将主机(jī )名设(shè )置为mail,单独解析到(dào )9,那(nà )么该解析(xī )记录(lù )优(yōu )先(xiān )泛域名在(zài )实际使(shǐ )用(yòng )中(zhōng )作用是非常(cháng )广泛的,比(bǐ )如实(shí )现无限二级(jí )域名功能(néng ),提供免费的url转发(fā ),在
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