We use SSL to encrypt the connection between you and the server, so nobody can snoop on your transfers in progress. If you are using SSL to connect to the mail servers themselves, then that is encrypted end-to-end too.

The script itself just copies your email contents into a variable, which is stored in temporary memory. It also processes thousands of emails per hour, and even if they were small they’d take up an astronomical amount of space and would slow everything down – which is why we’d rather they stay on the mail servers.