这里需要(yào )说明(míng )的是,在我们(men )系统里(lǐ )面如(rú )果(guǒ )单(dān )独设置一个子域名解析,比(bǐ )如(rú )将(jiāng )主(zhǔ )机名(míng )设(shè )置为mail,单独解(jiě )析(xī )到9,那(nà )么该解(jiě )析记录(lù )优先泛域(yù )名在(zài )实际(jì )使(shǐ )用中(zhōng )作用是(shì )非常(cháng )广泛的,比如实(shí )现无限二级域名功能,提供免(miǎn )费的url转发(fā ),在
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