The instructions added to the article provide an overview on how to configure Outlook 2019 to send signed e-mails.
The instructions are for Outlook 2019 but also apply to earlier versions of Outlook with minor adjustments.
NB! The user must have ID-software installed to sign e-mails.
English instructions for encrypting and signing Outlook 2019 e-mails: How to send digitally signed e-mails using SK certificates