Hello,
The majority of spam these days comes from IPs without PTR records
(NXDOMAIN or SERVFAIL trying to resolve). I tried to insert a header
indicating whether IP is "clean" with a PTR, but looks I misunderstand
how it should work.
In ACL:
begin acl
acl_clean_helo:
accept
verify = helo
condition = ${if
match{$sender_helo_name}{\N(\d{1,3}[.-]\d{1,3}[.-]\d{1,3}[
.-]\d{1,3})|([0-9a-f]{8})|([0-9A-F]{8})\N}{false}{true}}
add_header = X-Sender-Probably-Clean: $condition
acl_check_sender:
deny
acl = acl_clean_helo
senders = /etc/exim/sender_reject.list
accept
...the rest of ACL and other sections...
If I understand correctly, acl_clean_helo should always be called and
X-Sender-Probably-Clean be inserted, but it doesn't happen.
--
Sincerely,
Konstantin
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