这(zhè )里需(xū )要(yào )说明(míng )的是(shì ),在(zài )我(wǒ )们(men )系(xì )统里面(miàn )如果单独设置一个子域(yù )名解析(xī ),比(bǐ )如将主机(jī )名设置为mail,单独解析到9,那么(me )该(gāi )解析(xī )记录(lù )优先泛(fàn )域(yù )名在实(shí )际使用中(zhōng )作用是非(fēi )常广泛的,比如实(shí )现无限二级域名功(gōng )能,提(tí )供免费的url转(zhuǎn )发,在
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