If your iPhone or iPad displays Cannot Verify Server Identity, check the incoming mail server name in your email account settings.

For EDIS mailboxes, use mail.edis.at as the incoming server instead of your own domain. The server name must match the TLS certificate.

Open the Mail account settings on your device and update the incoming server name. The exact menu path depends on your iOS or iPadOS version.

Keep SSL/TLS encryption enabled. If the warning remains, contact EDIS support before accepting an unverified certificate.