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Thunderbird Fixes
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Some things I do right out of the box.

Tools > Add-ons and Themes > Search [ Full Address column ]       <---- always show full email address of sender and recipients

Edit > Settings > General > Display name: [ ] Show only display name for people in my address book   <----- UNCHECK this

Edit > Settings > General > [Config Editor...]

  change:

    mail.chat.enabled                              false          <---- disable chat
    mail.compose.default_to_paragraph              false          <---- default to body text
    mail.identity.default.archive_enabled          false          <---- disable archive
    mail.ui.display.dateformat.today               2              <---- always show the full date and time

  create string:

    intl.date_time.pattern_override.date_short     yyyy-MM-dd     <---- default to a proper ISO date


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Command Line Launch Thunderbird Shows Wrong Time in Date Column
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Problem appears to be that Thunderbird does not default to /etc/localtime.
You need an exported TZ variable in .shrc for the correct dates to show when run from a shell.

cat << EOF >> ~/.shrc
TZ=America/Toronto; export TZ
EOF

Open a new shell or sh ~/.shrc or logout and login, then run thunderbird.


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KDE GUI Launch Thunderbird Shows Wrong Time in Date Column
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Problem appears to be that Thunderbird does not default to /etc/localtime.
You need an exported TZ variable in .profile for the correct dates to show when launched from the gui.

cat << EOF >> ~/.profile
TZ=America/Toronto; export TZ
EOF

Alternatively add variable to KDE Launcher: Menu Editor > find Thunderbird > Environment Variables: TZ=America/Toronto

Logout and login, then launch thunderbird.