这(zhè )里需要(yào )说明的是(shì ),在我们系(xì )统里面如果(guǒ )单(dān )独(dú )设置(zhì )一个(gè )子域(yù )名(míng )解析,比(bǐ )如(rú )将主机名设置为mail,单独(dú )解析到9,那么该(gāi )解析记录优(yōu )先(xiān )泛(fàn )域(yù )名(míng )在实(shí )际(jì )使(shǐ )用中(zhōng )作用是非常广(guǎng )泛的,比如(rú )实现无限二级域名功(gōng )能,提供免费的url转发,在
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