diff --git a/install/dist/lib/fedora.lib.php b/install/dist/lib/fedora.lib.php
index 2d31b89bbd63bd459b1721e911e979820bcb0e60..683591d58f94d11a46dd5e902a1a7bbf5a299b38 100644
--- a/install/dist/lib/fedora.lib.php
+++ b/install/dist/lib/fedora.lib.php
@@ -163,8 +163,19 @@ class installer_dist extends installer_base {
 		$stress_adaptive_placeholder = '#{stress_adaptive} ';
 		$stress_adaptive = (isset($server_ini_array['mail']['stress_adaptive']) && ($server_ini_array['mail']['stress_adaptive'] == 'y')) ? '' : $stress_adaptive_placeholder;
 
+		$reject_unknown_client_hostname='';
+		if (isset($server_ini_array['mail']['reject_unknown']) && ($server_ini_array['mail']['reject_unknown'] == 'client' || $server_ini_array['mail']['reject_unknown'] == 'client_helo')) {
+			$reject_unknown_client_hostname=',reject_unknown_client_hostname';
+		}
+		$reject_unknown_helo_hostname='';
+		if ((!isset($server_ini_array['mail']['reject_unknown'])) || $server_ini_array['mail']['reject_unknown'] == 'helo' || $server_ini_array['mail']['reject_unknown'] == 'client_helo') {
+			$reject_unknown_helo_hostname=',reject_unknown_helo_hostname';
+		}
+
 		unset($server_ini_array);
 
+		$myhostname = str_replace('.','\.',$conf['hostname']);
+
 		$postconf_placeholders = array('{config_dir}' => $config_dir,
 			'{vmail_mailbox_base}' => $cf['vmail_mailbox_base'],
 			'{vmail_userid}' => $cf['vmail_userid'],
@@ -173,7 +184,10 @@ class installer_dist extends installer_base {
 			'{greylisting}' => $greylisting,
 			'{reject_slm}' => $reject_sender_login_mismatch,
 			'{reject_aslm}' => $reject_authenticated_sender_login_mismatch,
+			'{myhostname}' => $myhostname,
 			$stress_adaptive_placeholder => $stress_adaptive,
+			'{reject_unknown_client_hostname}' => $reject_unknown_client_hostname,
+			'{reject_unknown_helo_hostname}' => $reject_unknown_helo_hostname,
 		);
 
 		$postconf_tpl = rfsel($conf['ispconfig_install_dir'].'/server/conf-custom/install/fedora_postfix.conf.master', 'tpl/fedora_postfix.conf.master');
diff --git a/install/dist/lib/gentoo.lib.php b/install/dist/lib/gentoo.lib.php
index 342a583facb64e433a8410abf136c570f7e34df2..acd4dbcf618cbdd79388b8bc26cd3b828f9b9f0d 100644
--- a/install/dist/lib/gentoo.lib.php
+++ b/install/dist/lib/gentoo.lib.php
@@ -112,8 +112,19 @@ class installer extends installer_base
 		$stress_adaptive_placeholder = '#{stress_adaptive} ';
 		$stress_adaptive = (isset($server_ini_array['mail']['stress_adaptive']) && ($server_ini_array['mail']['stress_adaptive'] == 'y')) ? '' : $stress_adaptive_placeholder;
 
+		$reject_unknown_client_hostname='';
+		if (isset($server_ini_array['mail']['reject_unknown']) && ($server_ini_array['mail']['reject_unknown'] == 'client' || $server_ini_array['mail']['reject_unknown'] == 'client_helo')) {
+			$reject_unknown_client_hostname=',reject_unknown_client_hostname';
+		}
+		$reject_unknown_helo_hostname='';
+		if ((!isset($server_ini_array['mail']['reject_unknown'])) || $server_ini_array['mail']['reject_unknown'] == 'helo' || $server_ini_array['mail']['reject_unknown'] == 'client_helo') {
+			$reject_unknown_helo_hostname=',reject_unknown_helo_hostname';
+		}
+
 		unset($server_ini_array);
 
+		$myhostname = str_replace('.','\.',$conf['hostname']);
+
 		$postconf_placeholders = array('{config_dir}' => $config_dir,
 			'{vmail_mailbox_base}' => $cf['vmail_mailbox_base'],
 			'{vmail_userid}' => $cf['vmail_userid'],
@@ -122,7 +133,10 @@ class installer extends installer_base
 			'{greylisting}' => $greylisting,
 			'{reject_slm}' => $reject_sender_login_mismatch,
 			'{reject_aslm}' => $reject_authenticated_sender_login_mismatch,
+			'{myhostname}' => $myhostname,
 			$stress_adaptive_placeholder => $stress_adaptive,
+			'{reject_unknown_client_hostname}' => $reject_unknown_client_hostname,
+			'{reject_unknown_helo_hostname}' => $reject_unknown_helo_hostname,
 		);
 
 		$postconf_tpl = rfsel($conf['ispconfig_install_dir'].'/server/conf-custom/install/gentoo_postfix.conf.master', 'tpl/gentoo_postfix.conf.master');
diff --git a/install/dist/lib/opensuse.lib.php b/install/dist/lib/opensuse.lib.php
index 07dd5cc690f36cb46d6556e1a67cd9dae38c416e..cb145ea7df3c98a18b67bd0f76a600c78c2bdf92 100644
--- a/install/dist/lib/opensuse.lib.php
+++ b/install/dist/lib/opensuse.lib.php
@@ -174,8 +174,19 @@ class installer_dist extends installer_base {
 		$stress_adaptive_placeholder = '#{stress_adaptive} ';
 		$stress_adaptive = (isset($server_ini_array['mail']['stress_adaptive']) && ($server_ini_array['mail']['stress_adaptive'] == 'y')) ? '' : $stress_adaptive_placeholder;
 
+		$reject_unknown_client_hostname='';
+		if (isset($server_ini_array['mail']['reject_unknown']) && ($server_ini_array['mail']['reject_unknown'] == 'client' || $server_ini_array['mail']['reject_unknown'] == 'client_helo')) {
+			$reject_unknown_client_hostname=',reject_unknown_client_hostname';
+		}
+		$reject_unknown_helo_hostname='';
+		if ((!isset($server_ini_array['mail']['reject_unknown'])) || $server_ini_array['mail']['reject_unknown'] == 'helo' || $server_ini_array['mail']['reject_unknown'] == 'client_helo') {
+			$reject_unknown_helo_hostname=',reject_unknown_helo_hostname';
+		}
+
 		unset($server_ini_array);
 
+		$myhostname = str_replace('.','\.',$conf['hostname']);
+
 		$postconf_placeholders = array('{config_dir}' => $config_dir,
 			'{vmail_mailbox_base}' => $cf['vmail_mailbox_base'],
 			'{vmail_userid}' => $cf['vmail_userid'],
@@ -184,7 +195,10 @@ class installer_dist extends installer_base {
 			'{greylisting}' => $greylisting,
 			'{reject_slm}' => $reject_sender_login_mismatch,
 			'{reject_aslm}' => $reject_authenticated_sender_login_mismatch,
+			'{myhostname}' => $myhostname,
 			$stress_adaptive_placeholder => $stress_adaptive,
+			'{reject_unknown_client_hostname}' => $reject_unknown_client_hostname,
+			'{reject_unknown_helo_hostname}' => $reject_unknown_helo_hostname,
 		);
 
 		$postconf_tpl = rfsel($conf['ispconfig_install_dir'].'/server/conf-custom/install/opensuse_postfix.conf.master', 'tpl/opensuse_postfix.conf.master');