Mail: Only an Outgoing Account

[simplegray]

I have 4 email accounts within mail. One account is only used to send mail out. Specifically, it is a forwarding account. So I want people to see the address when I send mail, but there's no need to check incoming mail servers or anything because there are none. How do I change the settings so that I don't get that little image next to the account that is trying to tell me something's wrong (because it keeps checking a spurious incoming mail server).

 

[MisterMe]

Click on the account in the Accounts list.
Click the Advanced tab.
Uncheck Include when automatically checking for new mail.