Here to save the day when it comes to using disposable e-mail addresses in a single click is TrashMail.net and their Firefox extension.
With this extension, you can easily with right click access create free disposable email addresses and paste them directly in forms. This helps to protect you from spam mails and could be useful [...]

For some time now, when I am not sure if a place is going to spam me to death, I’ll give them a dummy E-mail address that I don’t check that often. That way I can still sign up for a service, before I see if they are going to send me a plethora [...]