Are certificates _required_ by the sender?

"Terje Tollisen" <tt@post.com> Wed, 08 May 2002 09:42 UTC

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From: Terje Tollisen <tt@post.com>
To: ietf-smime@imc.org
Date: Wed, 08 May 2002 04:26:12 -0500
Subject: Are certificates _required_ by the sender?
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Is the sender of an email required to have a certificate, or is it sufficient for the sender to have a copy of the certificate of the recipient? I am thinking of an automated system, where one party will always be the sender, and never receive emails. In addition, no signatures are required. Thus nobody will ever actually need the public key for the automated system. However, I’m uncertain if the sender can send S/MIME messages without having a certificate of it's own.

Thanks for your time
-Terry Tollisen

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