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How to DNS Blacklist with Exim?




Edit the file /etc/exim4/conf.d/main/02_exim4-config_options and insert the following after the very last line.

# Added TODAYS-DATE by YOURNAME
# Spamhaus RBL zen.spamhaus.org CHECK_RCPT_IP_DNSBLS = zen.spamhaus.org

Edit the file /etc/exim4/conf.d/acl/30_exim4-config_check_rcpt. Search for CHECK_RCPT_IP_DNSBLS acl and change the word "warn" to "deny" as shown below:

# Check against classic DNS "black" lists (DNSBLs) which list
# sender IP addresses
.ifdef CHECK_RCPT_IP_DNSBLS
deny
message = X-Warning: $sender_host_address is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
log_message = $sender_host_address is listed at $dnslist_domain ($dnslist_value: $dnslist_text)
dnslists = CHECK_RCPT_IP_DNSBLS
.endif

Restart Exim so that our configuration changes take effect:

/etc/init.d/exim4 restart





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