How to make a DKIM signature for outgoing messages in Thunderbird (SMTP-server does not support DKIM)?

SMTP-server does not support DKIM signature.
How to make a DKIM signature for outgoing messages in the Thunderbird?

I'm not familiar with this particular use of the terminology.
Thunderbird has S/MIME support built in. You can add PGP support via the Enigmail add-on. Both offer the means to sign and encrypt messages.
I see add-ons to support the checking of DKIM-signed incoming messages, but haven't found any yet for signing.
Is it something that an email client is entitled to do? The Wikipædia entry says
<blockquote>Both modules, signing and verifying, are usually part of a mail transfer agent (MTA).</blockquote>
and that means a server, as opposed to a client (MUA).

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