这(zhè )里需要(yào )说明(míng )的是(shì ),在我(wǒ )们系统里面如果(guǒ )单独设(shè )置(zhì )一个子域名解析,比如将主(zhǔ )机名设(shè )置为(wéi )mail,单(dān )独解析到9,那么该解析(xī )记(jì )录(lù )优(yōu )先泛(fàn )域名在实际(jì )使(shǐ )用(yòng )中作用是非(fēi )常广泛(fàn )的(de ),比如实(shí )现无(wú )限二级域(yù )名功能,提供免费的url转发(fā ),在
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