Very good such websites are:

Postilion.eti.pw
Mail.eti.pw
IslandMail.ml
Mailinator.com
Mailnesia.com
Dispostable.com
Maildrop.cc
Mytrashmail.com
Yopmail.com
Yopmail.fr
Mailsac.com
Mintemail.com
Fakemailgenerator.com
Spamgourmet.com
Crazymailing.com
Temp-mail.org
Throwawaymail.com
Getairmail.com
Guerrillamail.com
Moakt.com
Email-fake.com