Re: [exim] Bounce spam

> From: John McMurray

> <= <> H=cpe-172-89-165-229.socal.res.rr.com

I have
^cpe-\d+-\d+-\d+-\d+\.\w+\.res\.rr\.com$
in my local blacklist.
Other similar hostnames
condition = ${if match{$sender_host_name}{\N(\d{1,3}[-.]){3}\d\N}}
get greylisted.
https://github.com/Exim/exim/wiki/LenasConfig