这里需要(yào )说(shuō )明的是(shì ),在我们系(xì )统里(lǐ )面如(rú )果(guǒ )单(dān )独(dú )设置(zhì )一个子域名解析,比如将主机(jī )名设(shè )置为mail,单(dān )独解析(xī )到9,那么该解析(xī )记录优先泛域名在(zài )实际使用(yòng )中(zhōng )作(zuò )用(yòng )是(shì )非常(cháng )广(guǎng )泛(fàn )的,比(bǐ )如(rú )实现无限二级域(yù )名(míng )功能,提供免费的url转发,在
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