Mozilla’s Thunderbird has the ability to spell check your emails – However before this feature will work you need to download and enable your dictionary.
Firstly you must locate and download the dictionary of your choice. One of the easiest ways to do this is by using the link provided in options – to find this link click Tools > Options, within the options click on the Composition tab. You will see a blue hyperlink Download More Dictionaries which will tkae you to an official Mozilla webpage where you can find many different dictionaries.
After downloading the dictionary of choice, run the .xpi file using Mozilla Thunderbird inorder to install the dictionary.

Mozilla Thunderbird Dictionary
Next back on the composition tab enable the Enable spell check as you type. If you have installed your dictionary correctly then you should be able to select your dictionary from the drop-down box provided. Note: If you haven’t installed a dictionary the drop-down will contain no items!
If you are having trouble installing your dictionary you can try to install the add-on by going to Tools > Add-ons and then click the Install button. Browse to the .xpi file you just downloaded and click Open, this will install the dictionary.
In addition you can also enable the option to Check spelling before sending an email, however be aware this will spell check the entire email including previous replies.







