diff --git a/rowers/mailprocessing.py b/rowers/mailprocessing.py
index 803d65e0..9d3d824d 100644
--- a/rowers/mailprocessing.py
+++ b/rowers/mailprocessing.py
@@ -110,7 +110,7 @@ def make_new_workout_from_email(rower, datafile, name, cntr=0,testing=False):
 
         
     f,e = os.path.splitext(datafilename)
-    if fileformat == 'unknown' and e is not 'txt':
+    if fileformat == 'unknown' and 'txt' not in e:
         fcopy = "media/"+datafilename
         if not testing:
             if settings.CELERY: