这里需要说明(míng )的(de )是,在(zài )我们系(xì )统(tǒng )里面如(rú )果单独设置一个子(zǐ )域名(míng )解析,比如将(jiāng )主机名设置(zhì )为mail,单独解析(xī )到9,那么(me )该解析记(jì )录(lù )优先泛(fàn )域名(míng )在(zài )实(shí )际使用中(zhōng )作用(yòng )是(shì )非常广泛的,比(bǐ )如(rú )实(shí )现(xiàn )无限二级域名功(gōng )能,提供免(miǎn )费的url转发(fā ),在
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