I host several websites with my hosting provider. I have successfully installed several certificates for the domains hosted there. When I tried for the domain tugelarapids.co.za I got this message:
“Error creating new registration.Type: urn:acme:error:invalidEmail”
Strange. So I tried again and again
I eventually used my gmail address, and then it worked.
Is there a limit to the number of certificates lets encrypt will generate for a single email address?
I am using plesk control panel …
An example domain I installed a certificate using my email address : cavern.co.za
my email address is murray dot carte at oliviershoek dot co dot za
When I checked the logs for your client the only email I see being rejected with the invalidEmail error is for an address @olivierhoek.co.za. The server side is reporting that there was an error looking up the MX record for this domain.
I can verify that with a UDP query I get an NXDOMAIN, with TCP I get a SERVFAIL:
$> dig +tcp +short olivierhoek.co.za MX
;; connection timed out; no servers could be reached
I'm not sure how this can be done with the Plesk control panel - you should consider contacting Plesk support for this question. Certbot has a --update-registration flag that can be used for this.