[CentOS] spam control

[Feizhou]

David Mackintosh wrote:
> R Lists06 wrote:
> 
>> Have you considered changing your setup to reject emails in the smtp 
>> process
>> if they do not have a valid rcpt to? i.e. a valid email address on your
>> machine to accept them?
>>
>> This will eliminate much of what you are experiencing...
> 
> Well I'm willing to consider it.  The problem is that the 'primary' MX 
> for most of the inbound-relayed domains is a barracuda anti-spam device 
> which talks to a Exchange server through a secret-handshake pipe I can't 
> get at from the secondary.
> 

you can do regular pulls of valid email addresses from the Exchange box 
to your seconday. People have protected Exchange with postfix for example.