diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index 47af9ba4ae0..af3dce343f4 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -776,7 +776,8 @@ class CMailFile
 					dol_syslog("CMailFile::sendfile: mail end error=".$this->error, LOG_ERR);
 					$res=false;
 				} else {
-					$this->error = sprintf ("Sent %d messages\n", $result);
+                    $this->error = $langs->trans("SentXXXmessages", $result);
+					$this->errors[] = $langs->trans("SentXXXmessages", $result);
 				}
 			}
 			else
diff --git a/htdocs/langs/en_US/mails.lang b/htdocs/langs/en_US/mails.lang
index 3c512ca7286..e38b038cfee 100644
--- a/htdocs/langs/en_US/mails.lang
+++ b/htdocs/langs/en_US/mails.lang
@@ -78,6 +78,7 @@ ResultOfMailSending=Result of mass EMail sending
 NbSelected=Nb selected
 NbIgnored=Nb ignored
 NbSent=Nb sent
+SentXXXmessages=%s message(s) sent.
 ConfirmUnvalidateEmailing=Are you sure you want to change email <b>%s</b> to draft status?
 MailingModuleDescContactsWithThirdpartyFilter=Contact with customer filters
 MailingModuleDescContactsByCompanyCategory=Contacts by third party category