Version: KMail: 1.11.0 (using KDE 4.2.0) OS: Linux Installed from: Debian testing/unstable Packages When i sent an ecrypted mail, the same encrypted mail is copied into the sent folder. The thunderbird behaviour is to encrypt the mail twice: one using the recipient's public key, for the mail to send in truth, and one with my public key, for the mail to store in the sent folder. So i'll still be able to access the mail, while it will still be encrypted.
In kmail 1.11.90 from kde 4.2.69, I'm able to access the sent mail for other (and I'm sure it is encrypted in the disk), using the pgp encryption.