这里(lǐ )需(xū )要(yào )说明的是,在我们(men )系(xì )统里面如(rú )果单独设置一个子(zǐ )域名解析,比如将(jiāng )主机名(míng )设置为mail,单独解(jiě )析到(dào )9,那(nà )么该解析(xī )记录优(yōu )先(xiān )泛域名(míng )在实际使用中(zhōng )作(zuò )用是(shì )非常(cháng )广(guǎng )泛的,比(bǐ )如(rú )实现无(wú )限二级域(yù )名(míng )功能,提供免费的url转发(fā ),在
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