diff --git a/htdocs/admin/mails.php b/htdocs/admin/mails.php
index 03b4387b255..0504315075d 100644
--- a/htdocs/admin/mails.php
+++ b/htdocs/admin/mails.php
@@ -682,7 +682,7 @@ if ($action == 'edit') {
 		print '</td></tr>';
 
 		// Host server
-		if ($linuxlike && (isset($conf->global->MAIN_MAIL_SENDMODE) && $conf->global->MAIN_MAIL_SENDMODE == 'mail')) {
+		if ($linuxlike && (getDolGlobalString('MAIN_MAIL_SENDMODE') == 'mail')) {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTP_SERVER_NotAvailableOnLinuxLike").'</td><td><span class="opacitymedium">'.$langs->trans("SeeLocalSendMailSetup").'</span></td></tr>';
 		} else {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTP_SERVER", ini_get('SMTP') ?ini_get('SMTP') : $langs->transnoentities("Undefined")).'</td><td>'.(!empty($conf->global->MAIN_MAIL_SMTP_SERVER) ? $conf->global->MAIN_MAIL_SMTP_SERVER : '').'</td></tr>';
@@ -690,31 +690,31 @@ if ($action == 'edit') {
 
 
 		// Port
-		if ($linuxlike && (isset($conf->global->MAIN_MAIL_SENDMODE) && $conf->global->MAIN_MAIL_SENDMODE == 'mail')) {
+		if ($linuxlike && (getDolGlobalString('MAIN_MAIL_SENDMODE') == 'mail')) {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTP_PORT_NotAvailableOnLinuxLike").'</td><td><span class="opacitymedium">'.$langs->trans("SeeLocalSendMailSetup").'</span></td></tr>';
 		} else {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTP_PORT", ini_get('smtp_port') ?ini_get('smtp_port') : $langs->transnoentities("Undefined")).'</td><td>'.(!empty($conf->global->MAIN_MAIL_SMTP_PORT) ? $conf->global->MAIN_MAIL_SMTP_PORT : '').'</td></tr>';
 		}
 
 		// SMTPS ID
-		if (isset($conf->global->MAIN_MAIL_SENDMODE) && in_array($conf->global->MAIN_MAIL_SENDMODE, array('smtps', 'swiftmailer'))) {
+		if (in_array(getDolGlobalString('MAIN_MAIL_SENDMODE'), array('smtps', 'swiftmailer'))) {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTPS_ID").'</td><td>'.$conf->global->MAIN_MAIL_SMTPS_ID.'</td></tr>';
 		}
 
 		// AUTH method
-		if (isset($conf->global->MAIN_MAIL_SENDMODE) && in_array($conf->global->MAIN_MAIL_SENDMODE, array('smtps', 'swiftmailer'))) {
+		if (in_array(getDolGlobalString('MAIN_MAIL_SENDMODE'), array('smtps', 'swiftmailer'))) {
 			$authtype = getDolGlobalString('MAIN_MAIL_SMTPS_AUTH_TYPE', 'LOGIN');
 			$text = ($authtype === "LOGIN") ? $langs->trans("UsePassword") : ($authtype === "XOAUTH2" ?  $langs->trans("UseOauth") : '') ;
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTPS_AUTH_TYPE").'</td><td>'.$text.'</td></tr>';
 		}
 
 		// SMTPS PW
-		if (isset($conf->global->MAIN_MAIL_SENDMODE) && (in_array($conf->global->MAIN_MAIL_SENDMODE, array('swiftmailer')) || (in_array($conf->global->MAIN_MAIL_SENDMODE, array('smtps')) && getDolGlobalString('MAIN_MAIL_SMTPS_AUTH_TYPE') === "LOGIN"))) {
+		if (in_array(getDolGlobalString('MAIN_MAIL_SENDMODE'), array('smtps', 'swiftmailer')) && getDolGlobalString('MAIN_MAIL_SMTPS_AUTH_TYPE') != "XOAUTH2") {
 			print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_SMTPS_PW").'</td><td>'.preg_replace('/./', '*', $conf->global->MAIN_MAIL_SMTPS_PW).'</td></tr>';
 		}
 
 		// SMTPS oauth service
-		if (isset($conf->global->MAIN_MAIL_SENDMODE) && in_array($conf->global->MAIN_MAIL_SENDMODE, array('smtps')) && getDolGlobalString('MAIN_MAIL_SMTPS_AUTH_TYPE') === "XOAUTH2") {
+		if (in_array(getDolGlobalString('MAIN_MAIL_SENDMODE'), array('smtps', 'swiftmailer')) && getDolGlobalString('MAIN_MAIL_SMTPS_AUTH_TYPE') === "XOAUTH2") {
 			$text = $oauthservices[$conf->global->MAIN_MAIL_SMTPS_OAUTH_SERVICE];
 			if (empty($text)) {
 				$text = $langs->trans("Undefined").img_warning();
diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index 1b03ed0d604..b991b4542f9 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -847,7 +847,7 @@ class CMailFile
 					$this->smtps->setPW($loginpass);
 				}
 
-				if (!empty($conf->global->$keyforsmtpauthtype) && $conf->global->$keyforsmtpauthtype === "XOAUTH2") {
+				if (getDolGlobalString($keyforsmtpauthtype) === "XOAUTH2") {
 					require_once DOL_DOCUMENT_ROOT.'/core/lib/oauth.lib.php'; // define $supportedoauth2array
 					$keyforsupportedoauth2array = $conf->global->$keyforsmtpoauthservice;
 					if (preg_match('/^.*-/', $keyforsupportedoauth2array)) {
@@ -943,9 +943,39 @@ class CMailFile
 				if (!empty($conf->global->$keyforsmtpid)) {
 					$this->transport->setUsername($conf->global->$keyforsmtpid);
 				}
-				if (!empty($conf->global->$keyforsmtppw)) {
+				if (!empty($conf->global->$keyforsmtppw) && getDolGlobalString($keyforsmtpauthtype) != "XOAUTH2") {
 					$this->transport->setPassword($conf->global->$keyforsmtppw);
 				}
+				if (getDolGlobalString($keyforsmtpauthtype) === "XOAUTH2") {
+					require_once DOL_DOCUMENT_ROOT.'/core/lib/oauth.lib.php'; // define $supportedoauth2array
+					$keyforsupportedoauth2array = getDolGlobalString($keyforsmtpoauthservice);
+					if (preg_match('/^.*-/', $keyforsupportedoauth2array)) {
+						$keyforprovider = preg_replace('/^.*-/', '', $keyforsupportedoauth2array);
+					} else {
+						$keyforprovider = '';
+					}
+					$keyforsupportedoauth2array = preg_replace('/-.*$/', '', $keyforsupportedoauth2array);
+					$keyforsupportedoauth2array = 'OAUTH_'.$keyforsupportedoauth2array.'_NAME';
+
+					$OAUTH_SERVICENAME = (empty($supportedoauth2array[$keyforsupportedoauth2array]['name']) ? 'Unknown' : $supportedoauth2array[$keyforsupportedoauth2array]['name'].($keyforprovider ? '-'.$keyforprovider : ''));
+
+					require_once DOL_DOCUMENT_ROOT.'/includes/OAuth/bootstrap.php';
+
+					$storage = new DoliStorage($db, $conf);
+					try {
+						$tokenobj = $storage->retrieveAccessToken($OAUTH_SERVICENAME);
+						if (is_object($tokenobj)) {
+							$this->transport->setAuthMode('XOAUTH2');
+							$this->transport->setPassword($tokenobj->getAccessToken());
+						} else {
+							$this->errors[] = "Token not found";
+						}
+					} catch (Exception $e) {
+						// Return an error if token not found
+						$this->errors[] = $e->getMessage();
+						dol_syslog("CMailFile::sendfile: mail end error=".$this->error, LOG_ERR);
+					}
+				}
 				if (!empty($conf->global->$keyforsslseflsigned)) {
 					$this->transport->setStreamOptions(array('ssl' => array('allow_self_signed' => true, 'verify_peer' => false)));
 				}