diff --git a/php/src/mail/mailer.php b/php/src/mail/mailer.php
index ac2e9ad..cfdc84d 100644
--- a/php/src/mail/mailer.php
+++ b/php/src/mail/mailer.php
@@ -173,7 +173,8 @@ class mailer {
     $tos = str::join(",", $tos);
     msg::debug("Sending to $tos");
     if (!$mailer->send()) {
-      throw new MailerException("erreur d'envoi du mail", $mailer->ErrorInfo);
+      throw (new MailerException("erreur d'envoi du mail"))
+        ->setTechMessage($mailer->ErrorInfo);
     }
   }