You may just save yourself a bunch of time that can be much better spent than by repeatedly clicking 'Delete.' There are plenty of sites that offer temporary or anonymous email addresses so you can register for a site without giving them your real one.10 Minute Mail gives you a disposable address that expires in ten minutes, but you can extend by another ten as many times as you need to.
Trash Mail is similar, but it forwards the messages to your real inbox.
Just add a prefix or postfix to your Gmail address and the messages will still be sent to your regular inbox.
You can set up a filter in Gmail to have all messages sent to the "alias" address marked as spam or sent to a different folder.
Clicking on that will bring up a snapshot of the page.
It may not have all the features of the regular site, but all the content will be there. If you use Outlook, Microsoft gives you the option to create up to five aliases a year for your account.
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Obviously, since there's no password required, you don't ever want to use Mailinator for anything sensitive, but that's not what it's for anyway.
One of the best sites for finding them all in one place is Bug Me Not.
All you have to do is type in the URL for the site you want to view, and Bug Me Not will serve up a list of usernames and passwords for that site.
With a tagline like 'let them eat spam,' what's not to love?
If it's available, you'll see a Cached link pop up under the title in the preview window to the right.