diff --git a/config/config.json.template b/config/config.json.template
index 5dfd0a9..870bc50 100644
--- a/config/config.json.template
+++ b/config/config.json.template
@@ -15,5 +15,6 @@
     "mail_from": "sender@domain.com",
     "smtp_server": "localhost",
     "smtp_port": 25,
-    "smtp_transport": "none"
+    "smtp_transport": "none",
+    "smtp_strict": "yes"
 }
\ No newline at end of file
diff --git a/mailGraph.php b/mailGraph.php
index 5f986d7..cae8015 100644
--- a/mailGraph.php
+++ b/mailGraph.php
@@ -14,6 +14,7 @@
     // 1.11 2021/02/28 - Mark Oudsen - Bugfixes
     // 1.12 2021/03/01 - Mark Oudsen - Bugfixes - Adding mail server configuration via config.json
     // 1.13 2021/03/01 - Mark Oudsen - Added smtp options to encrypt none,ssl,tls
+    // 1.14 2021/03/01 - Mark Oudsen - Added smtp strict certificates yes|no via config.json
     // ------------------------------------------------------------------------------------------------------
     //
     // (C) M.J.Oudsen, mark.oudsen@puzzl.nl
@@ -22,9 +23,6 @@
     /////////////////////////////////////////////////////////////////////////////////////////////////////////
     /////////////////////////////////////////////////////////////////////////////////////////////////////////
 
-    // !!! NOTE: configure the script before usage !!!
-    // Sections are marked [CONFIGURE] across the script
-
     /////////////////////////////////////////////////////////////////////////////////////////////////////////
     /////////////////////////////////////////////////////////////////////////////////////////////////////////
     //
@@ -39,7 +37,7 @@
 
     // CONSTANTS
 
-    $cVersion = 'v1.12';
+    $cVersion = 'v1.14';
     $cCRLF = chr(10).chr(13);
     $maskDateTime = 'Y-m-d H:i:s';
 
@@ -55,7 +53,7 @@
     // -- swiftmailer/swiftmailer       https://swiftmailer.symfony.com/docs/introduction.html
     // -- twig/twig                     https://twig.symfony.com/doc/3.x/templates.html
 
-    // [CONFIGURE] Change only required if you decide to use a local central library, otherwise leave as is
+    // Change only required if you decide to use a local/central library, otherwise leave as is
     include(getcwd().'/vendor/autoload.php');
 
     /////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -374,6 +372,9 @@
     if ((isset($config['smtp_transport'])) && ($config['smtp_transport']=='tls')) { $p_smtp_transport = 'tls'; }
     if ((isset($config['smtp_transport'])) && ($config['smtp_transport']=='ssl')) { $p_smtp_transport = 'ssl'; }
 
+    $p_smtp_strict = 'yes';
+    if ((isset($config['smtp_strict'])) && ($config['smtp_strict']=='no')) { $p_smtp_strict = 'no'; }
+
     // --- CONFIGURATION ---
 
     // Script related settings
@@ -695,6 +696,29 @@
     if (($p_smtp_transport=='tls') || ($p_smtp_transport=='ssl'))
     {
         $transport = (new Swift_SmtpTransport($p_smtp_server, $p_smtp_port, $p_smtp_transport));
+
+        if ($p_smtp_strict=='no')
+        {
+            if ($transport instanceof \Swift_Transport_EsmtpTransport)
+            {
+                $transport->setStreamOptions([
+                    'ssl' => ['allow_self_signed' => true,
+                              'verify_peer' => false,
+                              'verify_peer_name' => false]
+                    ]);
+            }
+        }
+            if ($transport instanceof \Swift_Transport_EsmtpTransport)
+            {
+                $transport->setStreamOptions([
+                    'ssl' => ['allow_self_signed' => false,
+                              'verify_peer' => true,
+                              'verify_peer_name' => true]
+                    ]);
+            }
+        else
+        {
+        }
     }
     else
     {