diff --git a/phpBB/includes/functions_posting.php b/phpBB/includes/functions_posting.php
index f920be9c4b..7f45b2da8c 100644
--- a/phpBB/includes/functions_posting.php
+++ b/phpBB/includes/functions_posting.php
@@ -1180,36 +1180,32 @@ function user_notification($mode, $subject, $topic_title, $forum_name, $forum_id
 	$topic_title = ($topic_notification) ? $topic_title : $subject;
 	$topic_title = censor_text($topic_title);
 
-	// Get banned User ID's
-	$sql = 'SELECT ban_userid
-		FROM ' . BANLIST_TABLE . '
-		WHERE ban_userid <> 0
-			AND ban_exclude <> 1';
-	$result = $db->sql_query($sql);
-
-	$sql_ignore_users = ANONYMOUS . ', ' . $user->data['user_id'];
-	while ($row = $db->sql_fetchrow($result))
+	// Exclude guests, current user and banned users from notifications
+	if (!function_exists('phpbb_get_banned_user_ids'))
 	{
-		$sql_ignore_users .= ', ' . (int) $row['ban_userid'];
+		include($phpbb_root_path . 'includes/functions_user.' . $phpEx);
 	}
-	$db->sql_freeresult($result);
+	$sql_ignore_users = phpbb_get_banned_user_ids();
+	$sql_ignore_users[ANONYMOUS] = ANONYMOUS;
+	$sql_ignore_users[$user->data['user_id']] = $user->data['user_id'];
 
 	$notify_rows = array();
 
 	// -- get forum_userids	|| topic_userids
 	$sql = 'SELECT u.user_id, u.username, u.user_email, u.user_lang, u.user_notify_type, u.user_jabber
 		FROM ' . (($topic_notification) ? TOPICS_WATCH_TABLE : FORUMS_WATCH_TABLE) . ' w, ' . USERS_TABLE . ' u
-		WHERE w.' . (($topic_notification) ? 'topic_id' : 'forum_id') . ' = ' . (($topic_notification) ? $topic_id : $forum_id) . "
-			AND w.user_id NOT IN ($sql_ignore_users)
-			AND w.notify_status = " . NOTIFY_YES . '
+		WHERE w.' . (($topic_notification) ? 'topic_id' : 'forum_id') . ' = ' . (($topic_notification) ? $topic_id : $forum_id) . '
+			AND ' . $db->sql_in_set('w.user_id', $sql_ignore_users, true) . '
+			AND w.notify_status = ' . NOTIFY_YES . '
 			AND u.user_type IN (' . USER_NORMAL . ', ' . USER_FOUNDER . ')
 			AND u.user_id = w.user_id';
 	$result = $db->sql_query($sql);
 
 	while ($row = $db->sql_fetchrow($result))
 	{
-		$notify_rows[$row['user_id']] = array(
-			'user_id'		=> $row['user_id'],
+		$notify_user_id = (int) $row['user_id'];
+		$notify_rows[$notify_user_id] = array(
+			'user_id'		=> $notify_user_id,
 			'username'		=> $row['username'],
 			'user_email'	=> $row['user_email'],
 			'user_jabber'	=> $row['user_jabber'],
@@ -1219,30 +1215,29 @@ function user_notification($mode, $subject, $topic_title, $forum_name, $forum_id
 			'method'		=> $row['user_notify_type'],
 			'allowed'		=> false
 		);
+
+		// Add users who have been already notified to ignore list
+		$sql_ignore_users[$notify_user_id] = $notify_user_id;
 	}
 	$db->sql_freeresult($result);
 
 	// forum notification is sent to those not already receiving topic notifications
 	if ($topic_notification)
 	{
-		if (sizeof($notify_rows))
-		{
-			$sql_ignore_users .= ', ' . implode(', ', array_keys($notify_rows));
-		}
-
 		$sql = 'SELECT u.user_id, u.username, u.user_email, u.user_lang, u.user_notify_type, u.user_jabber
 			FROM ' . FORUMS_WATCH_TABLE . ' fw, ' . USERS_TABLE . " u
 			WHERE fw.forum_id = $forum_id
-				AND fw.user_id NOT IN ($sql_ignore_users)
-				AND fw.notify_status = " . NOTIFY_YES . '
+				AND " . $db->sql_in_set('fw.user_id', $sql_ignore_users, true) . '
+				AND fw.notify_status = ' . NOTIFY_YES . '
 				AND u.user_type IN (' . USER_NORMAL . ', ' . USER_FOUNDER . ')
 				AND u.user_id = fw.user_id';
 		$result = $db->sql_query($sql);
 
 		while ($row = $db->sql_fetchrow($result))
 		{
-			$notify_rows[$row['user_id']] = array(
-				'user_id'		=> $row['user_id'],
+			$notify_user_id = (int) $row['user_id'];
+			$notify_rows[$notify_user_id] = array(
+				'user_id'		=> $notify_user_id,
 				'username'		=> $row['username'],
 				'user_email'	=> $row['user_email'],
 				'user_jabber'	=> $row['user_jabber'],
@@ -1273,7 +1268,6 @@ function user_notification($mode, $subject, $topic_title, $forum_name, $forum_id
 		}
 	}
 
-
 	// Now, we have to do a little step before really sending, we need to distinguish our users a little bit. ;)
 	$msg_users = $delete_ids = $update_notification = array();
 	foreach ($notify_rows as $user_id => $row)
diff --git a/phpBB/includes/functions_privmsgs.php b/phpBB/includes/functions_privmsgs.php
index c40ceb088f..447920cfd5 100644
--- a/phpBB/includes/functions_privmsgs.php
+++ b/phpBB/includes/functions_privmsgs.php
@@ -1622,6 +1622,7 @@ function pm_notification($mode, $author, $recipients, $subject, $message, $msg_i
 
 	$subject = censor_text($subject);
 
+	// Exclude guests, current user and banned users from notifications
 	unset($recipients[ANONYMOUS], $recipients[$user->data['user_id']]);
 
 	if (!sizeof($recipients))
@@ -1629,18 +1630,12 @@ function pm_notification($mode, $author, $recipients, $subject, $message, $msg_i
 		return;
 	}
 
-	// Get banned User ID's
-	$sql = 'SELECT ban_userid
-		FROM ' . BANLIST_TABLE . '
-		WHERE ' . $db->sql_in_set('ban_userid', array_map('intval', array_keys($recipients))) . '
-			AND ban_exclude = 0';
-	$result = $db->sql_query($sql);
-
-	while ($row = $db->sql_fetchrow($result))
+	if (!function_exists('phpbb_get_banned_user_ids'))
 	{
-		unset($recipients[$row['ban_userid']]);
+		include($phpbb_root_path . 'includes/functions_user.' . $phpEx);
 	}
-	$db->sql_freeresult($result);
+	$banned_users = phpbb_get_banned_user_ids(array_keys($recipients));
+	$recipients = array_diff(array_keys($recipients), $banned_users);
 
 	if (!sizeof($recipients))
 	{
@@ -1649,7 +1644,7 @@ function pm_notification($mode, $author, $recipients, $subject, $message, $msg_i
 
 	$sql = 'SELECT user_id, username, user_email, user_lang, user_notify_pm, user_notify_type, user_jabber
 		FROM ' . USERS_TABLE . '
-		WHERE ' . $db->sql_in_set('user_id', array_map('intval', array_keys($recipients)));
+		WHERE ' . $db->sql_in_set('user_id', $recipients);
 	$result = $db->sql_query($sql);
 
 	$msg_list_ary = array();
diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index 6b5cca8abb..10fb57ea97 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -3587,4 +3587,37 @@ function remove_newly_registered($user_id, $user_data = false)
 	return $user_data['group_id'];
 }
 
+/**
+* Gets user ids of currently banned registered users.
+*
+* @param array $user_ids Array of users' ids to check for banning,
+*						leave empty to get complete list of banned ids
+* @return array	Array of banned users' ids if any, empty array otherwise
+*/
+function phpbb_get_banned_user_ids($user_ids = array())
+{
+	global $db;
+
+	$sql_user_ids = (!empty($user_ids)) ? $db->sql_in_set('ban_userid', $user_ids) : 'ban_userid <> 0';
+
+	// Get banned User ID's
+	// Ignore stale bans which were not wiped yet
+	$banned_ids_list = array();
+	$sql = 'SELECT ban_userid
+		FROM ' . BANLIST_TABLE . "
+		WHERE $sql_user_ids
+			AND ban_exclude <> 1
+			AND (ban_end > " . time() . '
+				OR ban_end = 0)';
+	$result = $db->sql_query($sql);
+	while ($row = $db->sql_fetchrow($result))
+	{
+		$user_id = (int) $row['ban_userid'];
+		$banned_ids_list[$user_id] = $user_id;
+	}
+	$db->sql_freeresult($result);
+
+	return $banned_ids_list;
+}
+
 ?>
\ No newline at end of file