Email ettiquette - why you shouldn't tell people you're busy
If you have been writing in your emails how busy you are, please reconsider it. You may be surprised to find out how offensive it is. I know you didn't mean it, but stop it. There is nothing wrong with writing a short email - maybe making an acknowledgement, and that you will get back to them as quickly as possible. But when you write how busy you are, and that you have other things that are more important to do, you are just slapping your client in the face. There is no need for that.
If you don't have time to write a long email, go ahead and send a short one, with the promise to follow up. Then leave that email in your "in box". That way, you will see it when you come back from whatever you have been doing, and you will actually follow up. The one-two punch for rudeness, which will lose a client, is to 1) tell them how busy you are, and then 2) never follow up.
If you are indeed too busy, your client will figure it out soon enough. And they will go hire someone else.
Posted by Brad Hall