Is it possible to have both?

letsencrypt for tls on port 25 for remote servers to verify

and tls-require verify auth on port 587 permitting self signed certificates
signed by myca only for client authentication without any risk of arbitrary CAs
providing forged certificates.

Perhaps I can move /etc/ssl/cert.pem, though I guess that may break ftp etc.

I am trying to replace ssh for client access to mail as it cannot be as energy
efficient considering it is not email client controlled and so more like a VPN

I understand email isn't the most secure but for internal comms on controlled
servers it is secure and highly functional.

Thanks, KC

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