I had a module working on an old D6 site where you could add subscriptions to MLT results (using apachesolr framework).

Is it possible to add MLT subscription sign ups to this module? The desired result would be an email to the sign up user whenever a new relevant node is added (relevance determined by solr's MLT, obviously).

I suspect it would function as the search sign ups do currently, by adding a small sign up form in the block.

I'm new to D7 but I might be able to help in coding if it's possible- tips on where to start would be appreciated.