Sending bulk email from a Python script

[Simon Willison]

I'm looking into building a simple one-way (announce only) mailing list 
system. The system will bulk-send messages to lists of around 5,000 email 
addresses. What's the most efficient way of delivering this kind of email 
volume from a Python script? The script will be running on a dedicated 
server with full access to sendmail etc.

Thanks,

Simon Willison
http://simon.incutio.com/