Disguising e-mail addresses in 2.0.x impossible??

Hiya,
Perhaps I don't know how to frame the question. That may explain why I've never received a response for it. I am asking for the last time this one.
I know it is possible, because Nigel has done it on exim0users archives. How do I make the e-mail addresses of the posters appear as "user at domain" and not user@domain in the searchable archives?
In exim-users archives, the footer says " This archive was generated by Pipermail 0.05 (Mailman edition)."
I hope it's not pipermail that does the disguising, but some code within Mailman. Which patch is that one??
Well, how is it done???? Specific reference to 2.0.x.
Thanks in advance.
cheers
- wash
+----------------------------------+-----------------------------------------+
Odhiambo Washington, wash@wananchi.com . WANANCHI ONLINE LTD (Nairobi, KE) |
http://ns2.wananchi.com/~wash/ . 1ere Etage, Loita Hse, Loita St., |
GSM: (+254) 722 743 223 . # 10286, 00100 NAIROBI |
+---------------------------------+------------------------------------------+
"Oh My God! They killed init! You Bastards!"
--from a /. post
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Odhiambo Washington