While browsing through the forums I found out that the webmail logo could be changed. So I tried it. No luck.
Using the control panel I went to mail then webmail and clicked on edit on the right side. Then I tried to point "Login Image URL:" to https://domain.net/images/sm_logo.png, also tried https://www.domain.net/images/sm_logo.png and https://domain.net/domain.net/images/sm_logo.png (thats the path I see in explorer). I believe the problem is in the path, however ...
I also searched the forum using keywords squirrel, logo, path, web, mail, and webmail in various combos. I found that the logo should be named "sm_logo.png" and it should be 308x111 which it is. I also used a transparent background.
I ran out of ideas so it was time to ask for help. Please help Thanks