[ndbug] Question about certificates and OpenSMTPD

[Hrishikesh Muruk]

Hi

I have never set up a OpenSMTPD before and dont have knowledge of how mail
servers/services work. Apologies, if this is a very basic or is in a
book/manual somewhere. If so, please point me in the right direction.

What is the certificate mentioned in the pki argument? What part does it
play in email ?

smtpd.conf man page says

"In this second example, the aim is to permit mail relaying for any user
that can authenticate using their normal login credentials. An RSA
certificate must be provided to prove the server's identity...."

The RSA certificate proves the identity of the sending server? How is that
accomplished?

What is a "keyfile"  (mentioned as part of the pki syntax) ?

Hrishi
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