Cannot get evolution to decrypt PGP/GPG emails

I have a problem on Ubuntu 12.04 getting Evolution 3.2.3 to decrypt PGP emails. If I save the ciphertext as a plain text file, I can decrypt it with "gpg --decrypt textfilename" but Evolution only shows the ciphertext block.

Do I need to remove the passphrase from my private key? I note that when I glog in it never asks me for the passphrase, which is weird.

If someone could provide me with a howto or any other clue on setting this up, I would be most grateful.

>Do I need to remove the passphrase from my private key?<


no, no, this must no be done as it will make the whole gpg useless.

I am not using evolution, so can not give exact hwto for that, so someone else will give you infos on that.
Is the gpg agent installed?