Jim Reid:
> On 2 Aug 2012, at 10:44, Varadi Gabor wrote:
> 
> > The log also shows that the "warning: numeric domain name in  
> > resource data of MX record for bond.com: 0.0.0.0"
> 
> Yes, I saw that. This should have resulted in a hard error, not a  
> warning.

If you don't like the result, use one of the following in
the SMTP daemon to block their mail:

check_client_mx_access (ditto for helo, sender,  recipient, etc.)
check_client_mx_access (ditto for helo, sender,  recipient, etc.)

        Wietse

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