Our site offers free resources in the form of guides written by experts and technical writers. When someone downloads one they are asked to submit their email address, a simple lead capture method, through a Marketo form.
We want to cross-sell our other guides that the lead has not seen/downloaded. This is proving incredibly difficult.
In essence I want a simple way of serving dynamic emails to each lead with three content spots that serve any of our wide selection of guides that the lead has not already recieved.
So far all I can think of is a large and un-maintainable series of emails and a bulky smart campaign to acheive this goal. There has to be a simpler way, right?