Using DKIM on outgoing mail

Is it possible to use DKIM on outgoing mail sent from Thunderbird? I have a record set up on the DNS server of my mail service hoster and mail sent from the webmail client provided by the hoster includes that DKIM data. How can it also be used for mail sent from Thunderbird (which is using the same server for outgoing mail)?

If it is leaving through the same SMTP server that is is being used. It is after all added by the outgoing server.

That’s taken for granted. My question is really how to do it. Are their plugins that do it? Some other solution?