Following are the steps to configure blackberry with smartermail account.

Sign up with Blackberry.net for an email address, i.e., [email protected]
Configure SmarterMail account to auto forward to [email protected]
Configure Blackberry to check Blackberry.net email.
Set the Reply-To setting to your SmarterMail email address.
Once it is configured your Blackberry will receive email to Blackberry account and also configures blackberry to set all outbound email replies to be sent to SmarterMail mailbox.