As everyone knows, it is possible to get quite a speed boost out of Mail.app by stripping all the bloat out of its Envelope index, an SQLite database Mail uses to store senders, recipients, subjects and so on.

Here is the tutorial from Hawk Wings the ultimate website for all Apple Mail users.

It worked for me and it increased dramatically the speed of Mail.app.

“Sometimes sensitive data needs to be sent via email and as it travels to its destination it can be intercepted by hackers, isps, the office i.t. geek or even a nosy government.” - Melvin RiveraHere is the full tutorial made by Melvin Rivera, it’s a bit tricky but just follow the steps… and it will work.FULL TUTORIAL!digg story

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.