Just log on to your i Cloud Mail account and click on Preferences from the gear symbol action pop-up menu.Then, go to the Accounts tab and Add an alias, then click OK and Done.
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.
You can find instructions for how to do so on Firefox, Opera, and Internet Explorer here, or you can use an add-on for Firefox or Chrome.
Sometimes, you can find login credentials for sites just by searching on Google.
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.
If you just need a quick burner account, it doesn't get much simpler.