diff --git a/htdocs/core/class/smtps.class.php b/htdocs/core/class/smtps.class.php
index 0c2a35f9f3f..cd6f64c3242 100644
--- a/htdocs/core/class/smtps.class.php
+++ b/htdocs/core/class/smtps.class.php
@@ -496,6 +496,10 @@ class SMTPs
                     return $_retVal;
                 }
             }
+			
+			// Default authentication method is LOGIN
+			if (empty($conf->global->MAIL_SMTP_AUTH_TYPE)) $conf->global->MAIL_SMTP_AUTH_TYPE = 'LOGIN';
+			
             // Send Authentication to Server
             // Check for errors along the way
             switch ($conf->global->MAIL_SMTP_AUTH_TYPE) {