这里需(xū )要说明(míng )的是(shì ),在我(wǒ )们系统里面(miàn )如果单(dān )独(dú )设(shè )置一个(gè )子(zǐ )域名解析(xī ),比如将主机名设置为mail,单独解析到9,那么(me )该解(jiě )析(xī )记录(lù )优先(xiān )泛(fàn )域名在实际(jì )使用中作用是非(fēi )常广泛(fàn )的,比(bǐ )如实(shí )现无(wú )限(xiàn )二级(jí )域名功(gōng )能,提(tí )供免费的url转(zhuǎn )发(fā ),在
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