The file xpilot-hacks-atmangle.mbox.bz2 contains the old
http://nslug.ns.ca/pipermail/xpilot-hacks/ mailing list's
archives. I've changed all @-chars to the string " ATAT ".
To get the original mbox file from this file you can do this:

bzip2 -cd xpilot-hacks-atmangle.mbox.bz2 | sed 's/ ATAT /@/g' > xpilot-hacks.mbox