这里需(xū )要说明的是(shì ),在(zài )我们系统(tǒng )里面(miàn )如(rú )果单独设置(zhì )一个(gè )子域(yù )名解析,比如将(jiāng )主(zhǔ )机名设(shè )置为mail,单独(dú )解(jiě )析到9,那么该解析(xī )记录优先(xiān )泛(fàn )域(yù )名在实际使用中(zhōng )作(zuò )用(yòng )是(shì )非(fēi )常广泛(fàn )的,比如实现(xiàn )无(wú )限二级域(yù )名功能,提供免(miǎn )费的url转发,在
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