Spam Assasin itself will not affect which account you use. You can use any e-mail account system (webmail, POP3, IMAP) to view your mail as before. Spam Assasin, according to my understanding, will delete all mail marked as spam.
Alternatively, if you want to view that mail instead of deleting it, you can use Spam Box to filter messages to a mailbox designed to catch spam mail. Spam Box is available to install and configure in CPanel as well. Using Spam Box, you can view messages in the spam box on Horde via webmail or IMAP in an application like Outlook.
I hope this helps.