Sending direct mailing thank you letters

does it work sending handwritten thank you letters or seasons greetings to potential clients? does it feel spammy to clients?

I think hand written notes go a long way in building a relationship with a client. I’ve received a few and I’m always happy to do so. Some people actually look forward to and get excited when they receive mail at their office

I’ve heard a few copywriters that do that rather than email pitching and it works for them. Don’t know what kind of volume they’re sending but they say they’ve had good results.