diff --git a/addons/snailmail/models/snailmail_letter.py b/addons/snailmail/models/snailmail_letter.py
index b21d6aacb60..2b57ff70a5a 100644
--- a/addons/snailmail/models/snailmail_letter.py
+++ b/addons/snailmail/models/snailmail_letter.py
@@ -258,20 +258,22 @@ class SnailmailLetter(models.Model):
                 activity = MailActivity.search(domain, limit=1)
 
                 activity_data = {
-                    'res_id': letter.res_id,
-                    'res_model_id': self.env['ir.model']._get(letter.model).id,
                     'activity_type_id': self.env.ref('mail.mail_activity_data_warning').id,
                     'summary': '[SNAILMAIL] ' + _('Post letter: an error occured.'),
                     'note': note,
-                    'user_id': letter.user_id.id,
                     'date_deadline': fields.Date.today()
                 }
                 if activity:
                     activity.update(activity_data)
                 else:
+                    activity_data.update({
+                        'user_id': letter.user_id.id,
+                        'res_id': letter.res_id,
+                        'res_model_id': self.env['ir.model']._get(letter.model).id,
+                    })
                     MailActivity.create(activity_data)
 
-                letter.write({'info_msg': note})
+                letter.write({'info_msg': note, 'state': 'error'})
 
         self.env.cr.commit()