Here is a link to some good software:
https://prism-break.org/en/ - including some email clients.
Even if you don't mind surveillance, remember that hackers might also be able to exploit the interface the "intelligence" agencies use to gain access to private data or spread malicious code.
As an email client, I personally use Thunderbrid, together with the lightning calender extension and some additional add-ons, e.g. enigmail for encryption. Sadly it's missing some functions im comparison to Outlook, but both my private and company communication are nobody's business:
http://www.theguardian.com/world/201...tion-user-data
Not giving away your email adress to everyone and their son is imo the key for spam avoidance, for registration at non important or fishy-looking sites, I either use a throwaway address or the bugmenot addon for the webbrowser.