Tax records are often not up to date, so it's VERY possible that whoever is living at the mailing address listed has been getting bombarded with investor's letters and post cards, and the actual owner has no idea.

@Lynne GarrisYou may want to confirm that the house is still occupied, before sending a letter/postcard.

And I mail market currently with a combo of a couple of different letter prompts and post cards.

This is why I thought a one-time mailing of postcards might be worthwhile. 

I am running a lead form ad (solicit people who see the ad to enter their name, property address, and phone number or email), so sort of like a digital postcard.

You can specifically target FSBO, expired listings and landlords with letters, post cards and outsourced cold calling etc. 

At the bottom of your letter or marketing postcard add:P.S. if your currently in escrow and the deal should fall through I'm here to give you a back up offer..Good luck...

All together I am mailing about 700 post cards to leads every 30 days. 

Postcards with photos mailed to nearby residences?  

Flyers" you need to ask about.It is letters vs postcards.