It is important that your recipient sees your mailer at the right time for them - that may not be after your first mailer - but, it might be after the 5th.

Pay attention to the yellow labels on the returns -- sometimes they'll actually show you a more current forwarding address for your target recipient.

The recipients get a lot of mail so you will want to be unique and stand out among the crowd.

If you have a solid agreement to collect from the recipient in the event the sender fails their obligation, it's often safe enough to front the money.  

Personally, I only send out "happy holidays" or "season's greetings" cards, unless I know personally that the recipient is celebrating Christmas.  

I think if your rent is such that an HCV tenant can afford to live there, it's not B/C ... so if it is B/C, tell you property manager to get someone in there, or to hit the road.I rent nearly exclusively to HCV recipients, and I can tell you plainly, I do everything I can to make their units as D+/C- as possible, but they are D units in D neighborhoods.  

I'd start searching on Redfin for homes under about $125k.Generally, if the recipient buys the property that I assess, they flip me a $500 fee.

And that turned out to be a company who was selling on behalf of their clients.Following that I sent out 150 Yellow Letters to a Tax Delinquent list - using yellowletters.com - complete with my NZ address and a "local" Florida phone number at the bottom of the letter, and got an amazing response of around 12%.I'm convinced it's the quality of the list which matters, and not (for the most part) locations, so long as it doesn't cost the recipient an arm and a leg to make contact with you.

@Ryan Igbanol I have received calls from sellers I didn't mail to either, however they were received by way of PO box and weren't the recipient name for that address.

The more you keep advertising your services, the more chance your business name becomes known to not only the recipients of your list, but also the people they talk to, their families and work colleagues.Some investors say 4 times, others never remove names from their list - ever.