There’s a lot of debate these days about whether you have to write thank you notes, and of course you don’t have to write them. You don’t have to do anything, really, except eventually die. You don’t even have to pay taxes if you can stay under the radar well enough.
There’s also the question of condolences. What are modern people supposed to do? It’s hard to know what to say, let alone what to commit to paper, so what should you do?
What do you do? Do you still send notes in the mail, of any sort? If you get notes, do you toss them in the trash, or do you hang on to them?
Just like a Slattery 
Big believer in Thank you notes. For very close friends that I see a lot, an email the day following an event works. For folks I do not know well, for customers, for my moms generation – a written note. I love getting mail and save the odd note as mementos.