这里需(xū )要(yào )说明(míng )的是(shì ),在我们系统里面(miàn )如果单(dān )独(dú )设置一个子域名解析(xī ),比如(rú )将主(zhǔ )机名设(shè )置为mail,单独解析到9,那么(me )该(gāi )解(jiě )析记(jì )录优(yōu )先(xiān )泛域(yù )名在实际(jì )使(shǐ )用中作用(yòng )是非常(cháng )广泛的(de ),比(bǐ )如实现(xiàn )无限二(èr )级域名功(gōng )能(néng ),提(tí )供免费的url转发,在
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