How to install Comodo email certificate?

Hi

There are two cache db files you need to delete, then re-import the certificate.

1. Delete the files /var/db/crls/crlcache.db and /var/db/crls/ocspcache.db. These can be found using Finder’s Go >; Go To Folder menu (Cmd + Shift + G). This resets the cache of accepted certificates in the system. It doesn’t remove them, it just forces the system to rebuild the caches upon restart.
2. Open Keychain Access (/Applications/Utilities/Keychain Access). Select Certificates in the Category picker on the left side. In the search bar, type in the word Class. Look through that list, and find any certificates that have a blue + symbol over their icon. These are the ones you need to modify.
3. Select one that has a blue +, and hit Command + I. Click the disclosure triangle beside the “Trust” list to show the list of permissions. Now, what we need to do is to set this certificate to use the system defaults. However, for some reason, when you select it, it doesn’t save. So what you need to do is this. Under “Trust”, where it says “Secure Sockets Layer (SSL)”, change the dropdown menu to say “No Value Specified”. Then, close the window. It will ask for your administrator permissions. Then, open the info pane for that certificate again. Under “Trust” again, now set the dropdown that says “When using this certificate:” to say “Use System Defaults”. You can then close out of the info pane, and enter your password again. Do this for any of the certificates that have a blue + on their icon. There should only be one or two at most.
4. Restart your system.

Thank you xtof06

Spot on, restarting Mail.app did the trick, thanks!

would you happen to know how to uninstall Comodo Antivirus from my mac?

I am also seeing this issue. It seems that sometimes when I double-click it will import it into "My Certificates" and sometimes only "Certificates". I can't reproduce the error or solution reliably - I don't know what is causing it. Tried on two different computers and several different key pair/certificates/ .p7s files.

I used runger56's solution.

http://www.hoylen.com/articles/it/email/security/cert-comodo.html

Looks like it has to do with Safari's integration with Keychain. This way, you do all the steps with Firefox.

Thanks for posting!

@Runger56

Thank you for posting this links, I followed all the steps and my certs from Comodo installed with NO problems.

Ok I have to ask. The Comodo Certificates are to encrypt email as I understand it. So, how do I get the encryption symbol to be an option. I can create a signature on my mac to have that option highlight but that doesn't mean I'm encrypting my email? Is that right , is everyone here confusing signing vs encrypting or am I missing something?

I have the issue that my certificate imports into keychain but the encrypt icon doesn't highlight as an option which is what the certificate is for.