diff --git a/phpBB/includes/acp/acp_board.php b/phpBB/includes/acp/acp_board.php
index c8f6f426c6..d9e30320af 100644
--- a/phpBB/includes/acp/acp_board.php
+++ b/phpBB/includes/acp/acp_board.php
@@ -454,6 +454,9 @@ class acp_board
 						'smtp_auth_method'		=> array('lang' => 'SMTP_AUTH_METHOD',		'validate' => 'string',	'type' => 'select', 'method' => 'mail_auth_select', 'explain' => true),
 						'smtp_username'			=> array('lang' => 'SMTP_USERNAME',			'validate' => 'string',	'type' => 'text:25:255', 'explain' => true),
 						'smtp_password'			=> array('lang' => 'SMTP_PASSWORD',			'validate' => 'string',	'type' => 'password:25:255', 'explain' => true),
+						'smtp_verify_peer'		=> array('lang' => 'SMTP_VERIFY_PEER',		'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => true),
+						'smtp_verify_peer_name'	=> array('lang' => 'SMTP_VERIFY_PEER_NAME',	'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => true),
+						'smtp_allow_self_signed'=> array('lang' => 'SMTP_ALLOW_SELF_SIGNED','validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => true),
 
 						'legend3'					=> 'ACP_SUBMIT_CHANGES',
 					)
diff --git a/phpBB/includes/functions_messenger.php b/phpBB/includes/functions_messenger.php
index f141637fb9..a6e4cb0679 100644
--- a/phpBB/includes/functions_messenger.php
+++ b/phpBB/includes/functions_messenger.php
@@ -1046,7 +1046,18 @@ function smtpmail($addresses, $subject, $message, &$err_msg, $headers = false)
 	}
 	$collector = new \phpbb\error_collector;
 	$collector->install();
-	$smtp->socket = fsockopen($config['smtp_host'], $config['smtp_port'], $errno, $errstr, 20);
+
+	$options = array();
+	$verify_peer = (bool) $config['smtp_verify_peer'];
+	$verify_peer_name = (bool) $config['smtp_verify_peer_name'];
+	$allow_self_signed = (bool) $config['smtp_allow_self_signed'];
+	$remote_socket = $config['smtp_host'] . ':' . $config['smtp_port'];
+
+	// Set ssl context options, see http://php.net/manual/en/context.ssl.php
+	$options['ssl'] = array('verify_peer' => $verify_peer, 'verify_peer_name' => $verify_peer_name, 'allow_self_signed' => $allow_self_signed);
+	$socket_context = stream_context_create($options);
+
+	$smtp->socket = stream_socket_client($remote_socket, $errno, $errstr, 20, STREAM_CLIENT_CONNECT, $socket_context);
 	$collector->uninstall();
 	$error_contents = $collector->format_errors();
 
diff --git a/phpBB/language/en/acp/board.php b/phpBB/language/en/acp/board.php
index 8b4db6a061..8b5e113b16 100644
--- a/phpBB/language/en/acp/board.php
+++ b/phpBB/language/en/acp/board.php
@@ -558,6 +558,8 @@ $lang = array_merge($lang, array(
 	'EMAIL_SIG_EXPLAIN'				=> 'This text will be attached to all emails the board sends.',
 	'ENABLE_EMAIL'					=> 'Enable board-wide emails',
 	'ENABLE_EMAIL_EXPLAIN'			=> 'If this is set to disabled no emails will be sent by the board at all. <em>Note the user and admin account activation settings require this setting to be enabled. If currently using “user” or “admin” activation in the activation settings, disabling this setting will disable registration.</em>',
+	'SMTP_ALLOW_SELF_SIGNED'		=> 'Allow self-signed SSL certificates',
+	'SMTP_ALLOW_SELF_SIGNED_EXPLAIN'=> 'Allow connections to SMTP server with self-signed SSL certificate.<em><strong>Warning:</strong> Allowing self-signed SSL certificates may cause security implications.</em>',
 	'SMTP_AUTH_METHOD'				=> 'Authentication method for SMTP',
 	'SMTP_AUTH_METHOD_EXPLAIN'		=> 'Only used if a username/password is set, ask your provider if you are unsure which method to use.',
 	'SMTP_CRAM_MD5'					=> 'CRAM-MD5',
@@ -574,6 +576,11 @@ $lang = array_merge($lang, array(
 	'SMTP_SETTINGS'					=> 'SMTP settings',
 	'SMTP_USERNAME'					=> 'SMTP username',
 	'SMTP_USERNAME_EXPLAIN'			=> 'Only enter a username if your SMTP server requires it.',
+	'SMTP_VERIFY_PEER'				=> 'Verify SSL certificate',
+	'SMTP_VERIFY_PEER_EXPLAIN'		=> 'Require verification of SSL certificate used by SMTP server.<em><strong>Warning:</strong> Connecting peers with unverified SSL certificates may cause security implications.</em>',
+	'SMTP_VERIFY_PEER_NAME'			=> 'Verify SMTP peer name',
+	'SMTP_VERIFY_PEER_NAME_EXPLAIN'	=> 'Require verification of peer name for SMTP servers using SSL / TLS connections.<em><strong>Warning:</strong> Connecting to unverified peers may cause security implications.</em>',
+
 	'USE_SMTP'						=> 'Use SMTP server for email',
 	'USE_SMTP_EXPLAIN'				=> 'Select “Yes” if you want or have to send email via a named server instead of the local mail function.',
 ));
diff --git a/phpBB/phpbb/db/migration/data/v31x/add_smtp_ssl_context_config_options.php b/phpBB/phpbb/db/migration/data/v31x/add_smtp_ssl_context_config_options.php
new file mode 100644
index 0000000000..92051dc3ca
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v31x/add_smtp_ssl_context_config_options.php
@@ -0,0 +1,32 @@
+<?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\v31x;
+
+class add_smtp_ssl_context_config_options extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array('\phpbb\db\migration\data\v31x\v3110');
+	}
+
+	public function update_data()
+	{
+		return array(
+			// See http://php.net/manual/en/context.ssl.php
+			array('config.add', array('smtp_verify_peer', 1)),
+			array('config.add', array('smtp_verify_peer_name', 1)),
+			array('config.add', array('smtp_allow_self_signed', 0)),
+		);
+	}
+}