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Thanks for the report; I currently maintain the FastJP.com website on behalf of FastJP so have looked into this. It appears to be a technical issue with the security certificates used for the underlying secure communication with the FastJP API server. FastJP uses Let's Encrypt and one of the root certificates they used expired on 30 September; details here: https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/ It looks like the fix is to update which root certificates are accepted by the website backend behind the FastJP.com website. I'm just looking into it now.
We are aware of an issue with emails from the Forum to Microsoft-based email accounts (hotmail/outlook/live.com email addresses). This is being looked into currently, thanks for your patience meanwhile.