这里需(xū )要(yào )说明的(de )是,在我们(men )系统里面(miàn )如果单(dān )独设置(zhì )一(yī )个(gè )子域名解析,比(bǐ )如将主机名设(shè )置为mail,单(dān )独解析(xī )到9,那(nà )么(me )该(gāi )解析记录优(yōu )先(xiān )泛域名在实际使(shǐ )用中(zhōng )作(zuò )用是(shì )非(fēi )常广泛的,比(bǐ )如实现无限(xiàn )二级域名功能,提(tí )供免(miǎn )费的(de )url转发,在(zài )
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