I'm just curious really about why different schools have different policies about this and wonder what other people think. A couple of the schools I've worked in positively encourage parents to contact teachers by email and one allows pupils to email homework or queries directly to teachers. A third school that I know well does not allow direct email contact between teachers and parents/pupils at all.
I actually welcomed the direct email contact, but I know some colleagues find it intrusive. I thought it would be interesting to see what other teachers do/prefer and whether it makes a difference if you are primary or secondary.