HTC Desire :: Multiple Email Account

At my work we use two email severs to receive our email. One server is for all the email sent within the company itself and the other server is for all the outgoing and incoming mail from outside the company. The problem is that both servers run different pop3 settings, but use the same email address. This is however not a problem to set up on outlook.

The problem is to set it up on my phone. I have already done the outside server (email), but when I try to set up our inter company server (email) my Desire says that there is already an account with the same email address. And I can thus not continue with the set up.