Quoting Tony Marques:
> I would just like to add to remember to reject your own domain
> names.... unless you like to talk you yourself. Also very popular
> among viruses.
The OP wrote he's already doing that, so I skipped that rules:
Block EHLO [my.ip.add.ress]:
condition = ${if eq {[$interface_address]}{$sender_helo_name}}
condition = ${if !eq {$interface_address}{$sender_host_address}}
Block EHLO my.dom.ain:
condition = ${if !eq {$interface_address}{$sender_host_address}}
condition = ${if match_domain {$sender_helo_name}{+local_domains}}
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