这里需要(yào )说明(míng )的是,在我(wǒ )们系统里面(miàn )如果单独(dú )设(shè )置一个子域(yù )名(míng )解(jiě )析,比(bǐ )如将主(zhǔ )机名设置为(wéi )mail,单(dān )独解析到(dào )9,那么该解析记(jì )录(lù )优(yōu )先泛(fàn )域(yù )名在实际使用(yòng )中作用是(shì )非常广泛(fàn )的,比如(rú )实现(xiàn )无(wú )限二级域(yù )名功(gōng )能,提供(gòng )免费的url转发,在
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