diff --git a/welco/sources/mail/models.py b/welco/sources/mail/models.py
index 494b16e..f3b42bd 100644
--- a/welco/sources/mail/models.py
+++ b/welco/sources/mail/models.py
@@ -126,6 +126,7 @@ class Mail(models.Model):
             'channel': 'mail',
             'post_date': self.post_date and self.post_date.strftime('%Y-%m-%d'),
             'registered_mail_number': self.registered_mail_number,
+            'external_id': self.external_id,
         }
         if 'alfortville' in getattr(settings, 'FLAVOURS', []):
             context['reference'] = self.reference