IMAP && Server certificate has expired

[Ben Boeckel]

On Sun, May 31, 2020 at 15:20:51 +0200, Matthias Apitz wrote:
> Server certificate has expired

<snip>

> This certificate belongs to:
>    AddTrust External CA Root
>    Unknown
>    AddTrust AB
>    AddTrust External TTP Network
>    Unknown
>    Unknown
>    SE

Your ISP has been affected by this:

    https://support.sectigo.com/articles/Knowledge/Sectigo-AddTrust-External-CA-Root-Expiring-May-30-2020

They may have fixed it already if the sibling reply is correct.

--Ben