diff --git a/build/run/installer.sh b/build/run/installer.sh
index e76490d..075ccef 100755
--- a/build/run/installer.sh
+++ b/build/run/installer.sh
@@ -90,8 +90,7 @@ postconf -e "smtp_header_checks = pcre:/etc/postfix/smtp_header_checks"
 
 # SPF and DKIM checks
 postconf -e "policy_time_limit = 3600"
-# postconf -e "smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_policy_service unix:private/policy, check_client_access pcre:/etc/postfix/whitelisted_domains, check_sender_access lmdb:/etc/postfix/whitelisted_emails, check_client_access pcre:/etc/postfix/blacklisted_domains, check_sender_access lmdb:/etc/postfix/blacklisted_emails"
-postconf -e "smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_client_access pcre:/etc/postfix/whitelisted_domains, check_sender_access lmdb:/etc/postfix/whitelisted_emails, check_client_access pcre:/etc/postfix/blacklisted_domains, check_sender_access lmdb:/etc/postfix/blacklisted_emails, check_policy_service unix:private/policy"
+postconf -e "smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_policy_service unix:private/policy, check_client_access pcre:/etc/postfix/whitelisted_domains, check_sender_access lmdb:/etc/postfix/whitelisted_emails, check_client_access pcre:/etc/postfix/blacklisted_domains, check_sender_access lmdb:/etc/postfix/blacklisted_emails"
 
 # Milter configuration
 postconf -e "milter_default_action = accept"
@@ -100,8 +99,7 @@ postconf -e "smtpd_milters = local:opendkim/opendkim.sock, local:opendmarc/opend
 postconf -e 'non_smtpd_milters = $smtpd_milters'
 
 # Blocking spam
-# postconf -e "smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain, reject_unknown_reverse_client_hostname, reject_unknown_client_hostname"
-postconf -e "smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain"
+postconf -e "smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain, reject_unknown_reverse_client_hostname, reject_unknown_client_hostname"
 postconf -e "smtpd_helo_required = yes"
 postconf -e "smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, check_helo_access pcre:/etc/postfix/helo_access, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname"