这里需要(yào )说明的是,在(zài )我(wǒ )们系(xì )统里面如(rú )果单独设置(zhì )一(yī )个子域名解析,比如将主(zhǔ )机名(míng )设置为(wéi )mail,单独(dú )解析到(dào )9,那么(me )该(gāi )解(jiě )析记(jì )录(lù )优先泛域名(míng )在实际(jì )使用(yòng )中作(zuò )用是非(fēi )常广泛的(de ),比如(rú )实现无(wú )限二级域名(míng )功能,提供免(miǎn )费的url转发,在
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