eM Client can't verify identity of "www.thunderbird.net"

Since today I get the following message when starting eM Client:


What should I do?

I would suggest to contact Cloudfare support via the link below as looks like its related to that.

Cloudflare Help Center

If you are a paying Cloudfare customer, you might just need to get an “updated certificate” from them.

Are you are running Cloudfare DNS Servers ? If you are, you could also maybe try switching back to your “Local ISP DNS Servers” (to test) if you still get the same error.

I found that the warning had to do with an internet calendar that I had subscribed to from Holiday Calendars — Thunderbird.

It seems that they issued a new certificate on the very same day and that the issue had nothing to do with eM Client.

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