4条cname记录
mail.free-mail.cn    指向：webmail.xinnetvip.com
smtp.free-mail.cn    指向：smtp.xinnetvip.com
pop.free-mail.cn  指向：pop.xinnetvip.com
admin.free-mail.cn   指向：admin.xinnetvip.com
1条mx记录
free-mail.cn  指向： mx.xinnetvip.com

需用客户域名替换free-mail.cn