Sorry to hear that. As others have mentioned the program doesn't actually play a role in retrieving or sending of emails, but rather acts as a plugin to change the way emails that are opened are displayed.
Having said that, sometimes weird problems do occur and I believe they are related to the way the BlackBerry handles third-party applications. Typically, performing a uninstall/re-install corrects the problem.
Please do let me know how you go (feel free to PM me or even contact our support team: BBSmart - Contact Us