@toMACsh, some mail service providers look for the IP number from which the request for mail has come. It is kind of a security thing, they don't want someone to be able to get YOUR mail from a strange location. VPN masks the IP number as part of the security it provides, so the mail server sees your email app as coming from the VPN IP, not your IP, and asks for the login information to make sure it's you. Turning off VPN allows the real IP to go through, which normally satisfies the mail server. That all assumes you are using VPN from a fixed home/office location where you have accessed mail before, of course. If you are a road warrior, your IP is constantly changing as you move around so you get to log in lots of times. Used to be a road warrior, saw this lots of times.