HO uses an SSL certificate provided by Let’s Encrypt, and it expired on 9/30/2021. I sent a link to the Greek cooking topic to my father, and his Apple Mail wouldn’t open it, probably because he has an older version of OSX. Details are here:
The link to COTQ worked fine for me in Linux and a very recent Mac Mail.
That is confusing. Apparently, there are different versions of the certs that some browsers are able to recognize, but others don’t. The problem came up twice, only on older Macs, once for my parents and once for a user in another forum who couldn’t even reach Wikipedia. That user was somehow able to configure her Safari to accept one version of the certificate. I don’t really know what’s going on, personally.