这里需(xū )要说明的是,在(zài )我们系统里面如果单独(dú )设置一个子(zǐ )域名解(jiě )析,比(bǐ )如将主(zhǔ )机(jī )名设(shè )置为mail,单独解析(xī )到9,那么(me )该解(jiě )析(xī )记(jì )录(lù )优先(xiān )泛域(yù )名(míng )在实(shí )际使用中作用是非常广泛(fàn )的,比(bǐ )如(rú )实现(xiàn )无(wú )限(xiàn )二(èr )级域名(míng )功能,提供(gòng )免费的url转发,在
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