How many times have you ever sent someone an email and then never heard back from them?  It happens ALL THE TIME!  However, there are some tips for better net-iquette if you are interested.  For instance, if you are sending out an email to someone and you expect a prompt response, make sure you reference it somewhere in the email by saying something like, "I look forward to speaking with you soon!"  If you are on the receiving end and have received some emails, make sure that you are prompt in your response, even if it is to say "no" to something or that you "can’t talk at the moment".  People will really appreciate a response no matter what, this way they know that you’ve received the email.  If you are at work, RESIST the temptation to check your email a million times (if you get a lot of email or are just obsessed.  It is not only unprofessional but unproductive, and I’m sure it will make your boss upset.  If you absolutely must check your email, work it out beforehand with your boss.  For example, if you take scheduled breaks, then would be a good time to check it.