PrintShop Mail does not include a spell-checking program. You can verify your text in any word processor that includes a spell checker and then copy / paste the text.

Also, there may be third party software that allows for scanning text in applications. I did a quick search on the internet, and found this:
http://malektips.com/windows_xp_wordpad_0002.html

(Note: I have not tested the software nor do I know how well it works if at all)

Kind regards,
Floris Dansen