Email setup question

I currently have my email at work setup through outlook 2010.

We just had a sales email account setup for myself and another guy to use so that when our customers email orders they don't have to send to myself or him and cc the other. I have successfully set it up and it will deliver them to the same inbox as my normal emails do.

My question is this. When I send a test email to that sales account, it comes in and when I click reply it defaults to the sales email account. Is there a way that I can default it to reply from my normal account? It has the "from" box and I can easily click and change it to reply from my default email but just trying to skip that step if possible.

This is not an exchange server either. It's a POP3 setup.