How to Sign Your Email with a Digital Certificate

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Mike Jetton

I'm running Mavericks and wanted to sign and encrypt via the Free Cert from Comodo. I had the same problem: "This certificate was signed by an unknown authority." in Keychain and it would not work in Mac Mail.

The problem in my opinion is because Keychain does not have the root and intermediate certificates in keychain from Comodo. I installed them from the link below and it works without error now.

https://support.comodo.com/index.php?_m=downloads&_a=view&parentcategoryid=26&pcid=1&nav=0,1

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justir7

This works for me on Mountain Lion; however, the certificate shows up as "This certificate was signed by an unknown authority." Not sure what the issue with that is.

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Postvisa13

Having the same issue with Mail in 10.8.2. Adding the certificate to keychain has no effect on Mail.

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NeilDavis777

Hi, Can you tell me why this 'How to Sign Your Email with a Digital Certificate' doesn't seem to work in OS X 10.8.2 Mail?

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