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I've created an 'Email Security Plus' certificate from Digicert. Successfully added it to Email Protection/Encryption/Internal Users.
When I send an email from this account the recipient (myself at an iCloud.com address) gets this warning in Mail.app: "Unable to verify message signature. Mail was unable to verify the authenticity of the S/MIME certificate "email@example.com". Messages signed by this user may be coming from a different source."
If I click on certificate info I can see a unchecked box with "Messages from "firstname.lastname@example.org" are valid if signed by "James". Ie "James" is the Common Name of the cert.
Do I need to have Common Name = "email@example.com"?
Or have I done something else wrong?
UTM Release 9.601-5