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=<[email protected]>
[...]
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.
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