这(zhè )里需(xū )要说明(míng )的是,在(zài )我(wǒ )们系统(tǒng )里面如(rú )果单独设(shè )置一个子域名解析,比(bǐ )如将主机名设置(zhì )为mail,单(dān )独解析到9,那么该解(jiě )析(xī )记(jì )录(lù )优先(xiān )泛域名(míng )在实际(jì )使(shǐ )用中作用是(shì )非(fēi )常广(guǎng )泛(fàn )的,比如实现无限二级(jí )域(yù )名功能,提供(gòng )免费的url转(zhuǎn )发,在
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