这(zhè )里需要说(shuō )明的是,在我们系统里面如果(guǒ )单(dān )独(dú )设置一个子域名解析(xī ),比(bǐ )如将主机(jī )名(míng )设(shè )置(zhì )为mail,单独(dú )解(jiě )析到9,那么(me )该解(jiě )析记录(lù )优先泛域名在实际(jì )使(shǐ )用中作用是非(fēi )常广(guǎng )泛(fàn )的,比如实(shí )现无(wú )限(xiàn )二级域名功能,提(tí )供(gòng )免费的url转发(fā ),在
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