Prevent access to OWA when not on corporate network

Hi

We have most of our users in Office 365 and they are accessing mail outside and inside. However because of some security concerns we would like some users only access mail via OWA on Office 365 when they are in corporate network

When they are outside they shouldnt be able to access their mail

I was exploring conditional access and just wondering if there is any option to do this

Dalibor Bosic