Re: [exim] Blocking hosts by (false) hostnames

Hi Jeremy,

>>  I'd
>> like to block all incoming mails from servers who announce themselves
>> as (upc.at).
>
> deny    condition = ${if eq {$sender_helo_name} {upc.at}}

that would also block mails from a valid upc.at-host. This might not be
problematic for upc.at, but for falsely claiming to be a yahoo or
google host it has a bit more of an impact.

I'm looking for a solution where the sender helo hostname doesn't
resolve/validate in the lookup.

Thanks again, Jan.