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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.
So much better than installing gmail notifier, if only it actually worked. Maybe the way to go is to just install the notifier, and then set it to not run on startup.