这里需(xū )要说明的是(shì ),在(zài )我们(men )系(xì )统里面如(rú )果(guǒ )单独设置一个子(zǐ )域名(míng )解析,比如将主机名设置为mail,单独解(jiě )析到9,那么(me )该解(jiě )析(xī )记录(lù )优先(xiān )泛(fàn )域名(míng )在(zài )实(shí )际(jì )使用(yòng )中(zhōng )作用(yòng )是非常广(guǎng )泛的,比如实(shí )现无限(xiàn )二级域名功能,提供免(miǎn )费的(de )url转(zhuǎn )发,在
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