Email Update Error: Check Certificate

I am suddenly getting the error “Check Certificate” when trying to retrieve new emails. How do I rectify this? I am using Vivaldi Mail (server settings here) on Sailfish OS on my Jolla 1.

My guess, It’s related to Let’s encrypts root certitificate expiration. I had also with my email server.

Another user in irc was able to fix the problem with:

I have exactly the same issue

Your email provider’s certificate has probably expired.
There is an option in the server settings of the email account
“Accept untrustworthy certificates”.
Sometimes you have to deactivate and reactivate the affected accounts, then the settings are compared again and the certificate is renewed.

For anybody else stumbling into this topic here:
please see @olf 's very detailled guide

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