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Pro No commitment necessary
You don't need to create an account on Discard.Email, and it's totally free.
Pro Can be used to verify emails
Emails sent to the throwaway email address are kept for 30 days. As long as you remember the address you used, you can view the emails and verify the email account.
Con Not all of the domains are owned by Discard.Email
Some of the domains are sponsored, which means Discard.Email can't guarentee they will be available down the road. That being said, it is very clear if you are about to use a sponsored domain.