A spell checker becomes really useful only if it can check the spelling as you type (and not just when you call for spelling help).
More Email Quick Tips
IncrediMail, of course, offers this feature.
Check the Spelling as You Type in IncrediMail
To turn on inline spell checking in IncrediMail:
- Select Tools | Spelling | Check spelling while typing from the menu of a message composition window to make sure the item is checked.
Note: you can easily expand IncrediMail's spell checking capabilities with additional dictionaries.

