这(zhè )里需(xū )要说明(míng )的是(shì ),在我们系(xì )统(tǒng )里面如果单独设置一(yī )个子域名(míng )解析,比(bǐ )如(rú )将主机名设(shè )置(zhì )为mail,单独(dú )解析到9,那么(me )该解(jiě )析记录优(yōu )先(xiān )泛域(yù )名在(zài )实际使用(yòng )中作(zuò )用是非(fēi )常广泛的,比如(rú )实现无限二级域(yù )名功能(néng ),提供(gòng )免费的url转(zhuǎn )发,在
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