Recommendation request for e-mail delivery system

Dear Internet: please recommend an online service that can help me automatically distribute computer files via e-mail.
At English PEN, we have begun to produce e-Books as part of our literary campaigning.  Our recent Catechism: Poems for Pussy Riot is a good example of this – It puts more literature and creativity into the world, in response to an act of censorship.
In that project, the e-Book was available free with a voluntary donation.  But we wanted to capture the e-mail addresses of everyone who downloaded it.  I used a tweaked version of a WordPress contact form plug-in to ‘reveal’ the download links after a person entered their e-mail address, but this was an inelegant method.  If downloaders wanted to revist the page, they had to enter their address again. And there was no validation of e-mail addresses.
Are there any online tools that manage the distribution of documents or computer files?  I need a simple system that will take a person’s e-mail address, log it for me, and then either send them a unique download link, or simply e-mail them a file.
I imagine that the Shareware Developer community must have some kind of solution in place for this task?  Can anyone recommend such services?  Or is there a WordPress plug-in I have missed.  Obviously I have a preference for free services, as the projects I run are all not-for-profit.

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