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

This is what Sender Policy Framework and DomainKeys infrastructure is
for. Follow the instructions for ACLs to reject mail based on SPF
and/or DKIM failures. False hostnames won't have such infra set up.

On 2/26/21 1:06 AM, Jan Kriesten via Exim-users wrote:
>
> Hi,
>
> is there a way to deny incoming mails from servers with certain (false)
> hostnames.
>
> I have many entries like
>
> 2021-02-26 06:41:37 H=(upc.at) [109.237.101.160] F=<Elon-Musk@???>
> [...]
>
> which I currently block either by IP or incoming e-Mail-Address, but I'd
> like to block all incoming mails from servers who announce themselves
> as (upc.at).
>
> Thanks! --- Jan.
>