This plugin for Scribe uses the Aspell library to check the spelling of an email.

And for informational purposes only, here is a screenshot:

I don't provide support for the Aspell library itself, but at the time posting this, to get a functional install I used the installer and english dictionary from here.

The general process is:

• Install Aspell
  Grab the full installer and run it, follow the prompts. Grab a dictionary (or 2) and install that as well.
• Download Plugin
  Download and unzip the Scribe aspell plugin into the Scribe directory. You'll have to find the right sub-folder for your version of Scribe:
  • Windows
  • Linux
• Install Plugin
  Open Scribe, and open the plugins setup (File->Plugins). Using the add button to select the Scribe_Spell.dll (or .so on unix). You will be asked to choose between "Aspell Text Pipe" or "Aspell Checker". Choose "Aspell Text Pipe" here.
• Configure The Plugin
  Double click the plugin in the list that you've just added and select the dictionary from the drop down list.