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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.
I just put addresses in the file specified by check_recipient_access with REJECT
getting mail lists and DKIM to play together
requires Linux and runs DNS and Postfix in a Docker node
Gotta have transit encryption, at least, where supported.
For Linux, dovecot, and rainloop, but the postfix stuff is useful