The 4-1 Auto-Responder approach is a really great way to not only keep your visitors engaged with your content but also be able to promote your affiliate products.
 
4-1 Autoresponder Approach

Meaning you want to send 4 emails of information to every one email that’s an affiliate promotion.
Its important your viewers feel you are providing value and not just trying to pitch them on a product.
 
Most people who use autoresponders make more than 50% of their profits from the autoresponder emails.
 
The 4-1 is just one type of approach.  You can use any approach that works best for you.
It may be 2-1, 3-1, or even 1-1.
It all will depend on the type of blog and products you are promoting.