I’ve noticed a real problem with email lately. Sometimes it’s due to those ornery spam filters. A person writes you, you answer, and you think that’s the end of it. I’ve never been a fan of unnecessary email so I didn’t follow up. So, the other day, I was stunned when someone told me that they never heard back from me. And I had responded quickly.
I have found a number of reasons. First, those pesky spam filters. The person I was answering never got it. They didn’t realize that their spam filter was eating up a lot of their mail, INCLUDING orders. Second, some people were using their lack of response as an excuse. I’ve had more than 1 web designer say they never heard from me because they wanted my client and they could point out…”look, she doesn’t answer email, and I’m a good person that does”. That’s a too common thing. And some people are just overwhelmed.
So, I’ve gotten rather clever with this. If it’s a web designer with for one of my hosting clients, after 5 days I write back to them, saying this is what I said, on such and such a day. Haven’t heard back from you, did you get it?” with a copy of this going to the client. And amazingly enough, there’s a response immediately. 
I cases of general inquiries or questions about orders, people usually never got them and are grateful you followed up.
It pays to be organized and inquire a bit. It shows you care.