这(zhè )里需(xū )要说明(míng )的是(shì ),在我们系(xì )统里面如果单(dān )独设置一个子域(yù )名解析,比如(rú )将(jiāng )主机名设置为mail,单(dān )独解析到9,那么该(gāi )解析记录优先(xiān )泛域(yù )名(míng )在(zài )实(shí )际使(shǐ )用(yòng )中作用是非常广泛(fàn )的(de ),比如(rú )实现无(wú )限(xiàn )二级(jí )域名(míng )功能,提(tí )供(gòng )免费的url转(zhuǎn )发,在
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