这里需(xū )要(yào )说明(míng )的是,在我们系统里面如(rú )果单(dān )独设(shè )置一(yī )个子域名(míng )解(jiě )析,比如将主机名设(shè )置为mail,单(dān )独解析(xī )到(dào )9,那么该解析(xī )记录(lù )优先(xiān )泛域(yù )名(míng )在实(shí )际(jì )使用中(zhōng )作(zuò )用是非(fēi )常(cháng )广(guǎng )泛的,比如实(shí )现(xiàn )无限二(èr )级域名功能,提供免费的url转发,在
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