diff --git a/install/dist/lib/debian60.lib.php b/install/dist/lib/debian60.lib.php
index b3887cbd235513c726f07ba3315822359ac7d2b4..d792c5a7b9466054ba29f371a23c79db1abce64f 100644
--- a/install/dist/lib/debian60.lib.php
+++ b/install/dist/lib/debian60.lib.php
@@ -57,7 +57,7 @@ class installer extends installer_base {
 		// Adding the amavisd commands to the postfix configuration
 		$postconf_commands = array (
 			'dovecot_destination_recipient_limit = 1',
-			'virtual_transport = dovecot',
+			'virtual_transport = lmtp:unix:private/dovecot-lmtp',
 			'smtpd_sasl_type = dovecot',
 			'smtpd_sasl_path = private/auth'
 		);
diff --git a/install/dist/lib/fedora.lib.php b/install/dist/lib/fedora.lib.php
index ab25741ee9ace42cbd56be625b28ac24eb1b80d0..628f012dba0efa91278e048cad2c197f6e6e97bf 100644
--- a/install/dist/lib/fedora.lib.php
+++ b/install/dist/lib/fedora.lib.php
@@ -402,7 +402,7 @@ class installer_dist extends installer_base {
 		// Adding the amavisd commands to the postfix configuration
 		$postconf_commands = array (
 			'dovecot_destination_recipient_limit = 1',
-			'virtual_transport = dovecot',
+			'virtual_transport = lmtp:unix:private/dovecot-lmtp',
 			'smtpd_sasl_type = dovecot',
 			'smtpd_sasl_path = private/auth',
 			'receive_override_options = no_address_mappings'
diff --git a/install/dist/lib/gentoo.lib.php b/install/dist/lib/gentoo.lib.php
index 99670eec1338e79223b66975dbb37c7fd4061179..7078f83dabd8e826334e8c0ac5bf81fb5020fc82 100644
--- a/install/dist/lib/gentoo.lib.php
+++ b/install/dist/lib/gentoo.lib.php
@@ -245,7 +245,7 @@ class installer extends installer_base
 		//* Reconfigure postfix to use dovecot authentication
 		$postconf_commands = array (
 			'dovecot_destination_recipient_limit = 1',
-			'virtual_transport = dovecot',
+			'virtual_transport = lmtp:unix:private/dovecot-lmtp',
 			'smtpd_sasl_type = dovecot',
 			'smtpd_sasl_path = private/auth'
 		);
diff --git a/install/dist/lib/opensuse.lib.php b/install/dist/lib/opensuse.lib.php
index 7663f7eb39cddbcb53732a0cdc8bc664dcef0368..9ec6bcf4711d6f7c90cb4f5ec42948d35265ca7c 100644
--- a/install/dist/lib/opensuse.lib.php
+++ b/install/dist/lib/opensuse.lib.php
@@ -437,7 +437,7 @@ class installer_dist extends installer_base {
 		// Adding the amavisd commands to the postfix configuration
 		$postconf_commands = array (
 			'dovecot_destination_recipient_limit = 1',
-			'virtual_transport = dovecot',
+			'virtual_transport = lmtp:unix:private/dovecot-lmtp',
 			'smtpd_sasl_type = dovecot',
 			'smtpd_sasl_path = private/auth',
 			'receive_override_options = no_address_mappings'
diff --git a/interface/web/admin/form/server_config.tform.php b/interface/web/admin/form/server_config.tform.php
index dde1d746a9e054470bed0252205181c910a37caf..0431660590601d64d8f10d59772101fd11be8c30 100644
--- a/interface/web/admin/form/server_config.tform.php
+++ b/interface/web/admin/form/server_config.tform.php
@@ -368,6 +368,12 @@ $form["tabs"]['mail'] = array(
 			'width' => '10',
 			'maxlength' => '255'
 		),
+		'mailbox_virtual_uidgid_maps' => array(
+				'datatype' => 'VARCHAR',
+				'formtype' => 'CHECKBOX',
+				'default' => 'n',
+				'value' => array(0 => 'n', 1 => 'y')
+		),
 		'relayhost' => array(
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',