Thunderbird “invalid security certificate” error

I recently upgraded my Ubuntu installation to 11.10 after not having used it in a while. Part of the upgrade to this new version (Oneiric Ocelot) is that automatically (I believe) adds Thunderbird to your installation, intending that you use it rather than previous client Evolution.

Now, I haven’t used Thunderbird in a while so its fancy new “detect my mail server settings” functionality was all new to me. It all actually went quite well, detecting my mail server name and ports by checking “common server names” based on my email address of (in my case

However my providers SSL certificate isn’t mapped to my domain so the certificate is flagged as “invalid”. There’s no option to accept this certificate so you have to go digging around in Preferences (Options on Windows versions).

What you need to do is go to Edit -> Preferences and go to Advanced -> Certificates -> View Certificates, From here, Add an Exception giving your server (e.g. Click ok and go back to account setup and it should allow you to proceed. Hope this helps and thanks to leepa at Mozzilazine Forums and also bpat1434.

Thunderbird/Outlook/Google Calendar Integration

Finally I can have events from my Outlook calendar in work sync with my Thunderbird calendar (enabled using the Lightning plugin) automatically. It’s wonderful… or at least it nearly is.

How It Works

I read some time back of a plugin that allows you to sync your Thunderbird/Lightning calendar (or Sunbird if you prefer to use Mozilla’s calendar in a standalone application) with your Google calendar, which I’m sure is useful for some people, but not me. I’ve never used a Google calendar really. However that memory proved useful when I heard that a Google have released a utility to allow you to sync your Google calendar with your Outlook calendar. I’m sure you can see where I’m going with this…

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nerd. links – Make Thunderbird Quote Headers in Replies

Inspired by Tech Chick (aka Gabrielle Atticus), I’ve decided to start listing some interesting if well-hidden sites on the internet so this will be the first in a series of nerd. links.

This one resolves a long-standing issue with Mozilla’s Thunderbird email client, ie the way it forwards messages.  Whereas Outlook, Outlook Express etc. forward some headers (to, from, subject, date etc) all you ever get in Thunderbird is “Sendername said:”.  It’s pretty pathetic really, especially the fact that there’s no date.

Luckily someone has made an add-on with the descriptive but not exactly ‘roll-off-the-tongue’ name “Change quote and reply format” to fix this problem. Now the quote header is much more useful:

—- Original message —–
Subject: something
Date: 01/01/2005

Unfortunately it doesn’t seem to be listed at Mozilla’s plugin site, so I only stumbled on it after googling a bit and reading a few forum pages.  The home page (linked above) isn’t very well designed, but there’s a more user-friendly description of the plugin at The Extensions Mirror.

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