sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
BURN.link - Send secure, encrypted, self-destructing messages
Mailinator - Any Inbox. Any Time.
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...
Protect IID - Protect your privacy with single-use email addresses