After doing some research on the Internet, I found 3 ways to get an anonymous email account. These ways vary in anonymity.
Riseup takes anonymity a huge step further than all email providers I’ve seen so far. You have to request an account if you want to use their services. If you mention your activism, or at least mention your beliefs in a free and open Internet, I can say confidently that you will be approved.
Riseup also offers other services, such as a VPN, DNS, chat, and etherpad.
Additionally, I found an interesting PDF at hosting.riseup.net. As a result of it being licensed in the Creative Commons license, I decided to upload the PDF to my site.
So go ahead and read Digital Security for Activists, and download it anonymously on this site.
Tor Mail can only be accessed via Tor (also known as “The Onion Network”). With that in mind, the only way to compromise your anonymity would be either to give away information about you, or if you have a bad exit node.
The onion address of Tor Mail is jhiwjjlqpyawmpjx.onion. You can also access Tormail through “onion.to” simply by typing in “.to” at the end of the onion address. Honestly, I would not recommend using onion.to. They are not as secure as Tor. Just download Tor Browser Bundle and you’re set.
Hushmail is by far the worst way to obtain anonymity with email. Although it is better than most common email providers, especially gmail, it does have some drawbacks.
First of all, you must sign in at least every 3 weeks or else you’ll be forced to purchase one of their paid email plans to access it. Obviously that is the opposite of freedom.
Hushmail also does not have a very clean record. For example, check out this article titled Hushmail Betrays Trust of Users.
I highly recommend that you use one of the two email providers above. Only use Hushmail as a last resort (or if you are comfortable with them squealing to the feds, which has happened).