You can do the same with http://spamgourmet.com.

Very nice! I need one that's also a Mozilla Persona provider, maybe I'll write my own one weekend...

Thanks for the tip. I always forget about these because the domains they use are usually too silly (they should just let us use raw IP addresses); and also because I use email so infrequently. Mailinator seems the only one I remember. There's another disposable email provider... I can't remember the name... the accounts are time-limited. Truthfully, it's an email forwarder; they ask for a personal email address. (Maybe you could forward to another disposable email provider.) You can choose to have the account last hours or days. I know I've seen it mentioned on HN.

You can also just add +domain to the local-part of your email address and do that without needing a disposable email service. Theoretically some sites may strip them out, but I doubt that many go to the trouble.

Please do note that there's quite a few services that do not recognize '+' as a valid character for who knows reasons. I don't know why though.

That only works with gmail.

It does work on gmail, but is definitely not gmail specific. Used to do that trick on my college email account.

It works for many mail servers, including Gmail.

Also any Google Apps servers. Seems like a lot of extra work to look up a domain's MX records to figure out if it's safe to strip anything after + from their email address, which will only serve to annoy your users anyway.

which others? doesn't do it on sendmail or postfix

Yahoo! Mail has such a feature, which I use and love. They do call it "disposable addresses", because you dump them when they start bringing spam.