Proxy sign messages

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I'd like to digitally sign all outbound email with a server's X.509
certificate (e.g. proxy sign).

Is it feasible for one certificate to be used to sign on another's
behalf (e.g. add a Sender: header field and sign with this Sender's
certificate)?  At least this would tell the recipient that the message
originated from a server with our certificate.

Or does the server need dedicated user certificates for each outbound
email sender?



Re: Proxy sign messages

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