5

I'm planning on creating a mail server, but I don't want to use passwords at all. They seem a wrong security choice to me.

I'd love to use a certificate to login. This seems easy to do in HTTP, but I found no way to do it in SMTP. Is there any way to do it?

If not, is there another option than passwords? OAuth, 2FA or anything else?

4

Look into client certificate validation for the SMTP server of your choice. For example, in Postfix you can use TLS client certificates as an authentication method.

2

kerberos (gssapi) or certificates are the options, I guess.

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