Encrypt Mail is an alternative solution to manual encryption or PSE keys. To send a message, simply double-click a person in the contact list and a new message window appears already addressed. To send an encrypted file, drag the file over the recipient's name and check the encryption option. Encrypt Mail will then ask the user to provide a password of the their choice to protect the archive. The application also offers the possibility to anonymize the names of the file attachments to be sent. Encrypt Mail does not store sent files and even has an option to prevent tracking of sent messages.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
