check server setting

If you're able to access the internet, an eSIM issue sounds an unlikely cause. Did you check the server settings and test they if the pass the connection test? # Navigate to settings > account name > fetching mail > incoming server # Click next. The error may simply be that the oAuth 2.0 access toen needs renewed (if you use this authentication type). It happens occasionally. Doing the above step normally resolved the error. The issue may also be a geo-block by your email provider. If they detect the connections from outside your home country as unusual traffic for you, they may have blocked access. Some email providers ask users to login to their web-mail and confirm they made the connection before allowing the app to reconnect. Are you using any VPN that may be causing difficulties with the connection?