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Ok...that means the command isn't in your path. You can either type in "locate postsuper", or "find / -name postsuper" (as root), then type in the whole path name of the command, such as "/usr/sbin/postsuper -xxx"
Your root password probably has NOTHING to do with your mail server being used by a spammer...maybe. Also, if your server has been compromised, changing your root password won't do much to fix it...there are probably many other avenues into your server, that have been put in place. And you should always open a new thread, for a new question.
That said, you need to be VERY sure that your server has been HACKED, versus having an unsecured mail relay server. The two are VERY different. If you're brand-new to Linux, and this is a company mail server, your best course of action would be to hire a consultant that specializes in Linux/mail servers. Securing a mail server is NOT a trivial task, and if you have been compromised, you need to sort it out NOW, not use it as a learning experience. There are many how-to guides you can find: