There are no shortage of disposable email services but I really like this one for its simplicity:
The excellently named (and free) MailDrop.cc is exactly that – an email drop for messages you don’t want to get sent to your main email account or things you might just want to keep secret or separate.
You don’t need to sign up, you just select a username and get going. Try mine – email@example.com. Feel free to send me confidential schematics or the codes to your death ray.
“You expect me to talk Mr Wright?”
“No, I expect you to send me email.”