Webaccess Spell Check
From Zarafa wiki
It is possible to disable the built-in spell check of the web access mail composer.
Inside /usr/share/zarafa-webaccess/client/widgets/fckeditor/fckconfig.js the option FCKConfig.BrowserContextMenuOnCtrl needs to be set to true:
FCKConfig.BrowserContextMenuOnCtrl = true ;
Now the browser spell check will be active while composing e-mail.