[Pkg-exim4-users] how to reject mails when Reverse DNS check fails?

[Hans Ekbrand]

Dear exim users,

I want to reject mail when Reverse DNS lookup fails, currently I only
get a warning - like this:

X-Host-Lookup-Failed: Reverse DNS lookup failed for 203.211.146.24 (failed)

I have
CHECK_RCPT_REVERSE_DNS = yes
CHECK_RCPT_SPF = yes

in /etc/exim4/conf.d/main/00_local_options

How do I configure exim to reject instead of warn?

Kind regards,

Hans Ekbrand