exchange 2010 安装FPE后 163.com qq.com 外网邮箱发给内网全部退信，内外给163，qq发邮件也会被拦截。和gamail互发邮件没有问题。FPE 安装完后默认配置。
退信后如下提示：
英文说明:SMTP error, RCPT TO: 550 5.7.1 :202.106.199.39:Client host 220.181.13.52 UnknownDNSName; Mail from IP banned. To request removal from this list please forward this message to delist.forefront@messaging.microsoft.com.(SMTP error, RCPT TO: 550 5.7.1 :202.106.199.39:Client host 220.181.13.52
UnknownDNSName; Mail from IP banned. To request removal from this list please
forward this message to delist.forefront@messaging.microsoft.com)
请问：这个是由forefront 造成的吗？怎么解决？
谢谢！