diff --git a/management/mail_log.py b/management/mail_log.py
index 1626f820..59c32c6e 100755
--- a/management/mail_log.py
+++ b/management/mail_log.py
@@ -586,7 +586,7 @@ def scan_postfix_submission_line(date, log, collector):
 def readline(filename):
     """ A generator that returns the lines of a file
     """
-    with open(filename) as file:
+    with open(filename, errors='replace') as file:
         while True:
           line = file.readline()
           if not line: