There is spamgourmet (<a href="https:&#x2F;&#x2F;www.spamgourmet.com&#x2F;index.pl" rel="nofollow">https:&#x2F;&#x2F;www.spamgourmet.com&#x2F;index.pl</a>). It doesn&#x27;t satisfy 4 exactly, but it&#x27;s pretty close. If you give out an email like &#x27;foo.20.myusername@spamgourmet.com&#x27; (there are other domains too), then it&#x27;ll forward 20 emails to the configured email for your account, but you can always log in and set it to 0 remaining at any point, regardless of how many emails have been received.