Create a free disposable email address! It's really easy to use:
Create a new email address on trashmail.net. All mails to this address will be forwarded to your real email address for a number of times you can set up on the following form. When the limit is reached, the Trashmail.net email address will be automatically deleted. All following mails (like spam, newsletter, etc) will be rejected at Trashmail.net.