Thanks! Cloning the mac address from my pc seems to have fixed the problem. I'm now able to read e-mails without VPN on all my devices.

Forgot to mention, that this happens both with Windows PC:s (Windows 10 & 11) and iPhone, iPad and MacBook, so it's not OS related.

Recently I have experienced problems with my e-mail, so that I'm able to receive e-mails unless I have VPN on. This affects only accounts on two providers (both by Telia). iCloud, MSN and Outlook...