[exim] rDNS MX check

Hi,

Anyone could help me with a reverse dns check and mx matching condition for
ACL?

deny   
    message        = Sorry, your IP address is not an allowed MX Server
    mx_accept      = 1.1.1.1 : 2.2.2.2 : 3.3.3.3
    condition      = ${if match{${lookup dnsdb {>: mxh =
$mx_accept}}}{1}{0}}

Thanks