Exactly what happens when you try to open the email on one of the computers? How are you accessing the email? With only the webmail interface and a browser? Or a desktop client like Outlook or Mac Mail?
Husband using Chrome on HP. Same problem
OK so again--------Exactly what happens when you try to open an email? Are you getting to the Inbox page?
The page with the emails won’t open. Then says it can’t reach server
Try using Chrome or Firefox instead of Safari and see if it works that way.