diff --git a/addons/mass_mailing/models/mailing.py b/addons/mass_mailing/models/mailing.py
index 870868c5757..f02234e7c8a 100644
--- a/addons/mass_mailing/models/mailing.py
+++ b/addons/mass_mailing/models/mailing.py
@@ -1440,6 +1440,9 @@ class MassMailing(models.Model):
                 )
 
             return content
+        except UnidentifiedImageError:
+            _logger.warning('This file could not be decoded as an image file.', exc_info=True)
+            raise
         except Exception as e:
             _logger.exception(e)
             raise ImportValidationError(_("Could not retrieve URL: %s", url)) from e