<a href="https:&#x2F;&#x2F;mailinator.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;mailinator.com&#x2F;</a> is an interesting option. Lots of domain names to use and you can easily point your own domain names&#x27; MX records at it. Meets (1) and (4), with the precaution that it&#x27;s a &quot;public blog&quot; approach to email and that anyone with the address and the knowledge it is hosted at Mailinator can check recent posts to that inbox. (Which is often perfectly fine for throw-away spam inboxes.) The mailbox itself doesn&#x27;t expire, but items in it will.<p>For (2)&#x2F;(3), if you register for an account you get a semi-private inbox that you can forward to your real email, but it is a step. I think if you upgrade plans you can set-up something more automated, but the current pricing page is surprisingly light on details from what I remember.