In mailer.get_standard_message 'Date:' header field is
made without checking currnet locale. If default locale
of system is not 'C'
(eg. pl_PL) time.strftime returns incorrect data string.

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I assume you mean that in pl_PL it returns a Polish (just 
guessing) version of the weekday / month strings? 
 
I *believe* that is valid, though I'm having trouble 
finding anything that makes the call one way or another. 
 
Certainly the RFC2822 spec clearly indicates that the 
strings to be used are the "C" locale equivalent strings. 

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Fixed if email.Utils is available for import (python 2.2+) 

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After update i've got exception in email.Utils.formtdate.
I made a quick fix attached below. I'm new to python
so it could be invalid.

--- mailer.py   2006-01-15 15:44:48.000000000 +0100
+++ mailer.py.new       2006-01-15 16:12:34.000000000 +0100
@@ -15,7 +15,7 @@
     from email.Utils import formatdate
 except ImportError:
     def formatdate(timeval):
-        return time.strftime("%a, %d %b %Y %H:%M:%S +0000",
timeval)
+        return time.strftime("%a, %d %b %Y %H:%M:%S +0000",
time.gmtime())

 class MessageSendError(RuntimeError):
     pass
@@ -60,7 +60,7 @@
         writer.addheader('Subject', encode_header(subject,
charset))
         writer.addheader('To', ', '.join(to))
         writer.addheader('From', author)
-        writer.addheader('Date', formatdate(time.gmtime()))
+        writer.addheader('Date', formatdate())

         # Add a unique Roundup header to help filtering
         writer.addheader('X-Roundup-Name',
encode_header(tracker_name,