这(zhè )里(lǐ )需(xū )要说明(míng )的是,在我们系统里面如果(guǒ )单(dān )独(dú )设置一个(gè )子域(yù )名解析,比(bǐ )如将主机名设(shè )置为mail,单独解析到(dào )9,那么(me )该解析记录(lù )优先(xiān )泛域(yù )名(míng )在实(shí )际使(shǐ )用中(zhōng )作用是(shì )非常广(guǎng )泛(fàn )的,比如(rú )实现无限二级(jí )域名功能,提供(gòng )免费的url转(zhuǎn )发,在
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