Just "reply"

OK. I'm going to vent for a few minutes.

I have several (many) pet peeves, but there's one that just sends me over the edge every time - and that's when people don't respond to email.

I mean really.
How difficult is it to hit "reply" and type up a quick response when somebody sends you an email that obviously DESERVES A RESPONSE?

If I send you an email that poses a question (or two or three) it is COMMON COURTESY to reply. In a timely manner. You know, within 24 hours or less. 

I don't care if you don't have the "right" answer - just respond with ANY answer. Tell me that things are still progressing. Or things are at a standstill for some unforeseen reason. Or tell me to quit sending you emails.

Just reply.
It's the proper thing to do.