I'm quite new to OpenPGP and am just starting to use it with Thunderbird.
When I encrypt a mail with a recipient's public key, using Thunderbird + Enigmail + OpenPGP, and send it, I can find the encrypted mail in my sent-folder. It is possible for me to decrypt (happens automatically) and read it, which is fine, but I wonder; how is this possible? Isn't this ciphertext only decryptable with the recipient's private key? Is it also decryptable with any of my keys (my public or private key)?