这里需(xū )要(yào )说明的(de )是(shì ),在我们系统里(lǐ )面如果单独设置(zhì )一个子(zǐ )域名解析(xī ),比(bǐ )如(rú )将主机名设(shè )置为mail,单独解析到9,那么该解(jiě )析记(jì )录(lù )优先泛(fàn )域名在实(shí )际(jì )使(shǐ )用中(zhōng )作用(yòng )是(shì )非常广(guǎng )泛的,比如实现无(wú )限二(èr )级域名功能(néng ),提供(gòng )免费的(de )url转发,在
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