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All the Perl that's Practical to Extract and Report

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Microsoft Outlook has this (Score:1)

by Accidental Angel (6668)

FWIW, Microsoft Outlook has a "Message Timeline" view.
markmail (Score:1)

by amoore (7054)

Markmail does this for many lists:
http://markmail.org/ [markmail.org]
If there's a public list that's not archived there, email them and ask them to add it. In my experience, they'll gladly add lists quickly.
I don't think you can get it for your own, private email, though.
GNUMail (Score:1)

by pdurbin (8820)

Perhaps you would benefit from the visualization of threads [collaboration-world.com] in GNUMail [collaboration-world.com].