I am looking to separate my work e-mails i receive internally from colleagues and e-mails that i receive externally.

Is there a rule i can do to categorize all e-mails that i receive externally, so that i can have my inbox more organised and have the separation between them. I tried to make a rule, but it did not go so well

I am using Microsoft outlook 2013, and my work e-mails use Microsoft exchange.... can anyone help?