这里(lǐ )需要说明的是(shì ),在(zài )我(wǒ )们系统里面如(rú )果单独设(shè )置一(yī )个子域名解析,比如将主(zhǔ )机名(míng )设置(zhì )为mail,单独解(jiě )析到(dào )9,那么该解析(xī )记录优(yōu )先(xiān )泛(fàn )域名(míng )在实(shí )际使(shǐ )用(yòng )中(zhōng )作用是非常广泛(fàn )的,比如实现无(wú )限二级域(yù )名(míng )功(gōng )能,提供免(miǎn )费的url转发(fā ),在
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