You can do it easily from `cron` (if you are on *nix) and most probably it can be done on Windows too. Calubre includes several command line tools, but for you the most important is `ebook-convert(.exe)`.

With that you can create a mobi ebook from the RSS recipe like:

    ebook-convert WHATEVER.recipe WHATEVER.mobi

Mailing can then be done like:

    calibre-smtp -a WHATEVER.mobi -u [email protected] -p PASSWORD -r smtp.PROVIDER.com --port 587 [email protected] [email protected] ''

And set up a cron/scheduler job to automail it to you.

[I'd recommend to read the fine manual.][2]

(***Note:*** this wont add the created mobi to your library! But you can do it with the `calibredb` command [as documented here][1])



  [1]: http://manual.calibre-ebook.com/cli/calibredb.html#calibredb-add
  [2]: http://manual.calibre-ebook.com/cli/ebook-convert.html