diff --git a/phpBB/install/schemas/schema_data.sql b/phpBB/install/schemas/schema_data.sql
index 55dd72db0d..e897a7b443 100644
--- a/phpBB/install/schemas/schema_data.sql
+++ b/phpBB/install/schemas/schema_data.sql
@@ -269,9 +269,9 @@ INSERT INTO phpbb_config (config_name, config_value) VALUES ('smilies_per_page',
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_auth_method', 'PLAIN');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_delivery', '0');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_host', '');
-INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_password', '');
+INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_password', '', 1);
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_port', '25');
-INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_username', '');
+INSERT INTO phpbb_config (config_name, config_value) VALUES ('smtp_username', '', 1);
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('teampage_memberships', '1');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('teampage_forums', '1');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('topics_per_page', '25');
diff --git a/phpBB/phpbb/db/migration/data/v32x/smtp_dynamic_data.php b/phpBB/phpbb/db/migration/data/v32x/smtp_dynamic_data.php
new file mode 100644
index 0000000000..aeaa3e8979
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v32x/smtp_dynamic_data.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\db\migration\data\v32x;
+
+class smtp_dynamic_data extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v32x\v326rc1',
+		);
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('custom', array(array($this, 'set_smtp_dynamic'))),
+		);
+	}
+
+	public function set_smtp_dynamic()
+	{
+		$smtp_auth_entries = [
+			'smtp_password',
+			'smtp_username',
+		];
+		$this->sql_query('UPDATE ' . CONFIG_TABLE . '
+			SET is_dynamic = 1
+			WHERE ' . $this->db->sql_in_set('config_name', $smtp_auth_entries));
+	}
+}
diff --git a/phpBB/phpbb/install/helper/config.php b/phpBB/phpbb/install/helper/config.php
index fad6749019..7eb0ae3b05 100644
--- a/phpBB/phpbb/install/helper/config.php
+++ b/phpBB/phpbb/install/helper/config.php
@@ -330,6 +330,8 @@ class config
 
 		fwrite($fp, $file_content);
 		fclose($fp);
+		// Enforce 0600 permission for install config
+		$this->filesystem->chmod([$this->install_config_file], 0600);
 	}
 
 	/**