Actalis is a Certification Authority that provides free S/MIME certificates. I was unable to make it work with any of my accounts in eM Client whereas Outlook has no problems with it. Where’s the culprit?
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I have the same problem.
After importing my certificate into emClient on Android, I get exactly the same message when I try to send a signed email.
I’ve just tested this with eM Client 10.3.1738 (984d31d) on Windows 11, and the certificate import went smoothly. Furthermore, sent myself a signed e-mail from em Client to a gmail account and Google reports the signature is valid.