1. 1.Download the latest .mailbundle and copy it to your bundles folder
   

    http://dl.dropbox.com/u/1304527/GPGMail.mailbundle.zip

    copy it into the folder /Users/%youruser%/Library/Mail/Bundles/

        (create the folder bundles, if it doesnt exist)

    open terminal

    type

    # defaults write com.apple.mail EnableBundles -bool true

    # defaults write com.apple.mail BundleCompatibilityVersion 3

    restart Mail

2. 2.Download and compile gnugp (you have to have X-Code installed)
   

    # curl -O ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-1.4.9.tar.bz2

    # openssl sha1 gnupg-1.4.9.tar.bz2

    SHA1(gnupg-1.4.9.tar.bz2)= 826f4bef1effce61c3799c8f7d3cc8313b340b55

    # tar xjvf gnupg-1.4.9.tar.bz2

    # cd gnupg-1.4.9

    # ./configure

    # make

    # make check

    # sudo make install

    if you have a 64bit mac you have to use ./configure --disable-asm instead of ./configure

3. 3.Install Keychain Access
   

   

    download  the latest GPG keychain access

    http://prdownloads.sourceforge.net/macgpg/GPG_Keychain_Access.0.7.0.1.zip?download

    and install it (you will need Rosetta)

4. 4.Create a keypair
   

    - open GPG Keychain Access

    - click New

    - select DSA ElGamal

    - select the appropriate key length

    - decide to have an expiration date or not

    - enter your name and your email address (Be careful: Don’t use special characters like ä, ö, ü, ...)

    - enter your passphrase

    - now your keypair is created

5. 5.Start Mail
   

    now you can encrypt and sign your emails