This guide helps you resolve the email error ‘ The server you are connected to uses an unverifiable certificate’.

Solution

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

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