String method cleanup.
diff --git a/Lib/mimify.py b/Lib/mimify.py
index 64e988b..c856910 100755
--- a/Lib/mimify.py
+++ b/Lib/mimify.py
@@ -110,7 +110,7 @@
             break
         match = res.group(1)
         # convert underscores to spaces (before =XX conversion!)
-        match = ' '.join(string.split(match, '_'))
+        match = ' '.join(match.split('_'))
         newline = newline + line[pos:res.start(0)] + mime_decode(match)
         pos = res.end(0)
     return newline + line[pos:]