I use Paul Close's 'makeindex.pl' tool to generate a TOPICS file containing
a summary of all subjects found in my mailing lists' archives.
This tool removes the "Re:" reply prefixes from the subject line while
trying to build a list of unique subjects. However, Paul's version does not
account for cc:Mail-style reply prefixes, such as "Re:".
I have applied a small patch to correct this situaion:
diff makeindex.pl makeindex2.pl
< 1 while ($subj =~ s/^Re2?:\s*//i); # trim all Re:'s
> 1 while ($subj =~ s/^Re(\[\d+\]|2?):\s*//i); # trim all Re:'s
If you are interested in effecting this change but rather not deal with the
code, I could also make the patched version of the program available via
e-mail or ftp.