Long story, but my neighbour moved out in difficult circumstances (house repossessed by his girlfriend).
He's emailed me to ask for pics of the house boarded up. I've not answered because ... I don't want to be in the middle of it. I don't have a friendship with the new owner, but then I was never close with him, either. (We got on alright.)
He's emailed again today asking why I didn't answer his Xmas greetings, and being cranky.
It feels rude not to answer ...