After the expiration of Let’s Encrypt root certificates, yesterday, there are many mail applications that can’t access to my box unless they accept the old certificate.
This box is still v.0.30 , so I don’t know if there is something I can do with this version and this Ubuntu.
There are 11 software packages that can be updated…
…but nothing seems to be related to Let’s Encrypt.
I am also afraid that if I reboot… a big certificate problen could arise and make my server unavailable.
Is there someone withe same problem?
Thank you In advance:
Lots of info here about the certificate question: DST Root CA X3 expiry countdown - ISRG/Organizational - Let's Encrypt Community Support