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Author here - We do that too! Typically we'll write a letter for the other person for their birthday. It's a much more reflective letter (whereas the daily note is more "what's going on right now"). Great tip.

To be honest, I think of something like this as far more intimate and thoughtful than writing a letter once a day. Sure, they're apples and oranges. But taking the time to write a letter each year forces you to think about the year in an anniversarial lens; the meaningful moments, the memories, the struggles, the victories, the journeys.

I do this as well with my wife of 10 years, although it's not something we agreed upon -- it just ends up happening in lieu of or in addition to a birthday/anniversary/valentine/whatever gift. Agreed on all points.

I still have all the letters that me and my partner wrote each other when we started dating. They're always nice to read again.

I love this idea, thanks for sharing it.