这里(lǐ )需(xū )要(yào )说明(míng )的是,在我们系(xì )统里(lǐ )面如果单独设(shè )置(zhì )一(yī )个(gè )子域名解(jiě )析,比(bǐ )如将(jiāng )主机名设置(zhì )为mail,单(dān )独解析到9,那么(me )该解析(xī )记录(lù )优(yōu )先泛(fàn )域名在实(shí )际使用(yòng )中作用是非常广泛(fàn )的,比如(rú )实现(xiàn )无(wú )限二(èr )级域名功能,提(tí )供免费(fèi )的url转发,在
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