What Is Your Favorite Direct Mail Service?

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Hi Bigger Pockets,

I want to start a direct mail campaign that is unique, budget-friendly, and most importantly – easy to systematize.

I was wondering what direct mail services you all like to use. 

Which ones are the most affordable? The most customizable? The easiest to use?

Also, is there anything you have learned that you wish you had known before you embarked on your first big direct mail campaign? I won't ask for your "special sauce," but are there any general tricks for making mail more likely to be opened, read, and acted upon?