- Mailinator. In some sense, a good idea. Namely, when it's only about cutting the link to your real-world identity when entering an e-mail address (like for registering on some site). You have to access Mailinator with TOR though or you might still get tracked down.
- mail.riseup.net: You need either two friends to refer you, or to wait between a day and some weeks to get approved for an e-mail account.
More on that: Section on e-mail in Tech Tools for Activism: "Signing up for an independent email address is not an immediate automated process, because of spammers. For example, aktivix.org issues email addresses though a friend-of-a-friend basis. If you know someone with an aktivix.org email address, you can fill in a the sign up form at www.aktivix.org Alternatively, you can sign up for an account at riseup.net or autistici.org. You will need to fill in a short form letting them know why you want the email and they normally respond in 24 hours."
"Stay away from email services that make their money by collecting user data: it’s a business model that’s bad for privacy. You may have to pay a few dollars a month to a private email service that encrypts and securely stores your data. Some examples are Unspyable, Countermail, Silent Circle, or Lavabit." [source]