Outlook sends emails with a J instead of the smiley :)
The reason is due to the Wingdings font face, which is missing on non-Windows platforms. This add-on fixes the most common situations.
More details:
http://lifehacker.com/5574668 http://superuser.com/questions/159334
Clone the repository locally then run make
$ git clone https://github.com/richq/smileyfixer.git $ cd smileyfixer $ make
Install the resulting xpi file in Thunderbird 3+ from the Add-ons menu option.
This add-on is also available from the Mozilla Add-ons site.
https://addons.mozilla.org/en-US/thunderbird/addon/smiley-fixer/
License
All code is covered by the Apache version 2.0 license.