I like the browser plugin here which lets you generate these e-mails easily.<p>An open source version would really be handy for people who 
host their own domains.<p>I could use a FireFox extension which lets me click next to some e-mail field to generate an address by talking to some web shim on my server at home, which generates the alias and binds it to my e-mail address via &#x2F;etc&#x2F;aliases, and restarts Exim.<p>The generated e-mail could actually be a cookie which contains not only some random ID but an encoded version of the domain name of the site against whose page it was generated.  So later, when that address is being abused, you can tell where it came from without looking up any association in any file or database.