This guide helps you resolve the mail error ‘ The server you are connected to uses a certificate that cannot be verified’.

Solution

The aforementioned error message appears in your email software/client because you are using IMAP/POP/SMTP server names in the form mail.domaine.xyz with the SSL option enabled, while the SSL certificate is only valid for the domain infomaniak.com.

You should therefore only use mail.infomaniak.com as the incoming and outgoing server to use SSL on the connection. Learn more