Our encrypted exporting service, which is included with the backup service available via in-app purchase, doesn't transmit your notes via email. When you elect to encrypt and export notes from within Insight Notes, the app makes a copy of the notes you want to export, encrypts those notes with a custom download code that you have assigned to that particular export, and then uploads the encrypted package to our dedicated servers. Once it arrives, the server sends an email to whomever you choose, and that email (which comes from the server) contains a temporary link to the encrypted file. Clicking on the link brings up a webpage with a box to input the download code, and once the code is entered correctly the server then decrypts the file and transmits the notes via SSL connection.
More details about the encrypted exporting service can be found here.