diff --git a/htdocs/core/class/smtps.class.php b/htdocs/core/class/smtps.class.php
index c6eb249be5c..e7b0207595a 100644
--- a/htdocs/core/class/smtps.class.php
+++ b/htdocs/core/class/smtps.class.php
@@ -476,13 +476,17 @@ class SMTPs
 			if (!is_numeric($conf->global->MAIL_SMTP_USE_FROM_FOR_HELO)) {
 				// If value of MAIL_SMTP_USE_FROM_FOR_HELO is a string, we use it as domain name
 				$hosth = $conf->global->MAIL_SMTP_USE_FROM_FOR_HELO;
-			} else {
+			} elseif ($conf->global->MAIL_SMTP_USE_FROM_FOR_HELO == 1) {
 				// If value of MAIL_SMTP_USE_FROM_FOR_HELO is 1, we use the domain in the from.
 				// So if the from to is 'aaa <bbb@ccc.com>', we will keep 'ccc.com'
 				$hosth = $this->getFrom('addr');
 				$hosth = preg_replace('/^.*</', '', $hosth);
 				$hosth = preg_replace('/>.*$/', '', $hosth);
 				$hosth = preg_replace('/.*@/', '', $hosth);
+			} elseif ($conf->global->MAIL_SMTP_USE_FROM_FOR_HELO == 2) {
+				// If value of MAIL_SMTP_USE_FROM_FOR_HELO is 2, we use the domain in the $dolibarr_main_url_root.
+				global $dolibarr_main_url_root;
+				$hosth = getDomainFromURL($dolibarr_main_url_root, 1);
 			}
 		}