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certificate
By 2029, certificate lifetimes will drop to 47 days.
Free Email certificates from COMODO. Our free email certificates with digital signature ensure confidentiality and privacy. Get free (S/MIME) Certificates.
[LetsEncrypt and ZeroSSL certificates are only for domain validation (web/server encryption).]
You can upload your own certificate.
see also: Competency-Based Education
https://en.wikipedia.org/wiki/Competency-based_learning
These are recognized by MSIE now, for error-free SSL. great for free email certs too