这里需要(yào )说明的是,在我们(men )系统里面(miàn )如(rú )果单独设(shè )置一个子域名解(jiě )析(xī ),比(bǐ )如将(jiāng )主(zhǔ )机名设置为mail,单独解析到9,那么(me )该解析(xī )记录(lù )优(yōu )先泛域名在实(shí )际使用(yòng )中作(zuò )用是非(fēi )常广泛的(de ),比(bǐ )如实现(xiàn )无(wú )限二级(jí )域(yù )名功能,提(tí )供免(miǎn )费的(de )url转发(fā ),在
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