Are you saying that you only allow your subscribers to use your DNS Servers and block access to all other DNS Server?
On 4 September 2012 11:07, Ibrahim <ibrah...@gmail.com> wrote: > Hi All, > > I've read old archive about blocking SMTP port (TCP port 25). In my current > situation we are mobile operator and use NAT for our subscribers and we > have few spammers, a bit difficult to track it because mostly our > subscribers are prepaid services. If we block TCP port 25, there might be > "good" subscribers will not be able to send email. > We are thinking to block MX queries on our DNS server, so only spammer that > use their own SMTP server will got affected. All DNS queries from our > subscribers already redirected to our DNS cache servers. But seem Bind > don't have feature to block MX query. Any best practice to block MX query? > > > Regards > Ibrahim > -- ???????????????????? ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????? BaconZombie LOAD "*",8,1