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I had some problems when I wanted to do attach a huge data file (such 
as mp3, avi, or etc.) to an email. Current smtpd.py in Python2.5 calls 
process_message that takes a string for its argument. This cause python 
running process to consume too much memory.
I'd like to suggest an alternative method for this purpose 
process_message_huge that takes a file-descriptor for its argument. The 
patch will use process_message_huge if the method exists, otherwise, it 
will call process_message with a string that will consume a huge memory 
for backward compatibility.