How to import a signing certifikate into a Vivaldi mail client (win 8.1pro)?
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Hi,
what is the complete procedure for import, installation, QCA (qualified personal signature certificate) see. e.g. https://www.postsignum.cz/kvalifikovane_certifikaty.html
to portable vivaldi mail client (OS 64bit windows 8.1 pro)....?
Thank you for your operational response.