这里需(xū )要说明的是,在(zài )我们系统里(lǐ )面如(rú )果单独(dú )设(shè )置一个子域名解析,比如(rú )将(jiāng )主机(jī )名设置(zhì )为mail,单独(dú )解析(xī )到(dào )9,那么该解析记录(lù )优先泛域(yù )名(míng )在实(shí )际使用中(zhōng )作用是非(fēi )常广泛的,比(bǐ )如实现(xiàn )无限二(èr )级(jí )域(yù )名功能,提(tí )供免费的(de )url转发,在
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