diff --git a/functions.inc.php b/functions.inc.php
index 3fbbee19..42d1d3e6 100644
--- a/functions.inc.php
+++ b/functions.inc.php
@@ -1398,6 +1398,13 @@ function smtp_mail($to, $from, $data, $password = "", $body = "") {
         return false;
     } else {
         smtp_get_response($fh);
+        fputs($fh, "STARTTLS\r\n");
+        smtp_get_response($fh);
+
+        stream_set_blocking ($fh, true);
+        stream_socket_enable_crypto($fh, true, STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT);
+        stream_set_blocking ($fh, true);
+
         fputs($fh, "EHLO $smtp_server\r\n");
         smtp_get_response($fh);