diff --git a/htdocs/comm/mailing/class/mailing.class.php b/htdocs/comm/mailing/class/mailing.class.php
index 84132f05218..70824302bb4 100644
--- a/htdocs/comm/mailing/class/mailing.class.php
+++ b/htdocs/comm/mailing/class/mailing.class.php
@@ -244,7 +244,7 @@ class Mailing extends CommonObject
 		global $conf, $langs;
 
 		// Check properties
-		if ($this->body === 'InvalidHTMLStringCantBeCleaned') {
+		if (preg_match('/^InvalidHTMLStringCantBeCleaned/', $this->body)) {
 			$this->error = 'InvalidHTMLStringCantBeCleaned';
 			return -1;
 		}
@@ -313,7 +313,7 @@ class Mailing extends CommonObject
 	public function update($user, $notrigger = 0)
 	{
 		// Check properties
-		if ($this->body === 'InvalidHTMLStringCantBeCleaned') {
+		if (preg_match('/^InvalidHTMLStringCantBeCleaned/', $this->body)) {
 			$this->error = 'InvalidHTMLStringCantBeCleaned';
 			return -1;
 		}
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index d4bef79259e..c3cd667aef6 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -7604,7 +7604,7 @@ function dol_htmlwithnojs($stringtoencode, $nouseofiframesandbox = 0, $check = '
 				} catch (Exception $e) {
 					// If error, invalid HTML string with no way to clean it
 					//print $e->getMessage();
-					$out = 'InvalidHTMLStringCantBeCleaned';
+					$out = 'InvalidHTMLStringCantBeCleaned '.$e->getMessage();
 				}
 			}
 
@@ -7640,7 +7640,7 @@ function dol_htmlwithnojs($stringtoencode, $nouseofiframesandbox = 0, $check = '
 				} catch (Exception $e) {
 					// If error, invalid HTML string with no way to clean it
 					//print $e->getMessage();
-					$out = 'InvalidHTMLStringCantBeCleaned';
+					$out = 'InvalidHTMLStringCantBeCleaned '.$e->getMessage();
 				}
 			}