If you have a .mac account and you enable encryption in iChat, you'll get an autogenerated certificate in your Keychain.
Go to your Keychain to check if you do have it.
If you found it, you will be able to use it to encrypt your mails... Just go to your Keychain preferences and check "Search .Mac for Certificates".
Then you'll see this little icon when composing a Mail in Mail.app from your .mac account.
PS: you must have the other person's certificate to encrypt mail to it.
Labels: Tips and How To
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