diff --git a/welco/sources/mail/management/commands/feed_mail.py b/welco/sources/mail/management/commands/feed_mail.py
index 64568aa..26fb737 100644
--- a/welco/sources/mail/management/commands/feed_mail.py
+++ b/welco/sources/mail/management/commands/feed_mail.py
@@ -36,6 +36,8 @@ class Command(BaseCommand):
         for filepath in args:
             if not os.path.exists(filepath):
                 continue
+            if not open(filepath).read(5) == '%PDF-':
+                continue
             mail = Mail(content=File(open(filepath)))
             mail.scanner_category = kwargs.get('category')
             mail.save()