TempMail - Temp Mail is the provider of fake and temporary email ID.
BURN.link - Send secure, encrypted, self-destructing messages
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
Mailinator - Any Inbox. Any Time.
1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...