For ListSource are you using it only to CREATE the list (csv) or do they also have the ability to create the mailer (postcard or whatnot) straight in there as well?

Truth is it takes a LOT of “grunt” work, or the capital to pay someone to do the repetitive work of cold calling, answering inquiries, drawing up numerous offers that will never be accepted, sending out property sale notices to buyers that will never complete the purchase and will attempt to go around you directly to the seller, addressing post cards, placing “bandit” signs, etc.  

lastly, are yellow letters or postcards still effective?

I sent a postcard to my brother in law regarding his rental as a joke.

I was thinking of mailing them as well, just trying to keep cost down as much as possible starting out, but I think I will follow up with a letter in the mail or a postcard to those outside my neighborhood and those I door knock.

I have decided to send postcards to absentee owners.

For every batch of leads, we go through a process where we text, call (2 to 3 times) and then send a direct marketing campaign (postcard.)

We are going to throw $2,000/month at automated post card mailings.

Or like what kind of letters and postcards are most commonly sent out?

I've seen quite a few distressed properties in PG, I'd say reach out to off-market wholesalers OR investor realtors (I'm on in VA) OR drive for dollars/send out post cards