HELP! Deleted a Keychains file. X509

a Keychains folder that contained the X509 certificates was accidentally deleted. I now cannot use Mail. How can I get this back on my system correctly?

Unless someone knows of a more convenient way of solving this problem, if you don’t have a backup, I believe you’ll have to Archive and Install Mac OS X (make sure you have enough available disk space to do it before proceeding), then install the appropriate updates.
BTW, although this has Mail implications, the issue itself has nothing to do with Mail, so you may want to ask in a more appropriate forum, such as Installation & Setup.

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