(Sometimes earlier) Use a mix of postcards and letters (talk to the printing company you plan on using and they can give you advice on what is working!)  

I sent out my first direct mail marketing campaign of 254 postcards last month and got 8 calls from those postcards and was able to get one house under contract and currently in the process of closing in on that deal.

For example, text postcard then color postcard then white letter then zip letter?

One common feedback that is given to me from my absentee leads is "I get about 5 postcards a month." 

They usually favor an ineffective letter or postcard because they're cheap and too lazy (but no one tells them this; I do!). 

Preferably a post card to save on costs.

I am doing my first test of post cards next week.

I mailed a couple letters and a postcard....

I have came across some investors talking about sending "Yellow Letters and/or Postcards to Sellers".

@Dev Horn - post cards i assume??