Hi Robert Edmands. Since Edge is a browser, are you trying to set Cox webmail as your home page when you open Edge? You will always have to log into Cox Webmail as this a security feature of being web-based. If so, here are the instructions. - Lisa, Cox Support Forums Moderator
Tap the three-dot menu button on the top right.
Check the box for A Specific Page Or Pages under the Open With section. ...
Click the down arrow at the end of the drop down menu.
Pick Custom. ...
Enter the URL of the page you wish to add.
I was thinking about mailto links. What program opens after clicking a mailto link. I don't believe Edge allows you to select Edge as a default app; however, if you have Chrome also installed, you could select chrome.
If you select an online service (Cox), you're right about still having to login.