No one is perfect and we all make mistakes, but there is no excuse for this. Get yourself a good email program, learn how to use it, and spell-check all of your correspondence. You know what they say, you only get one chance to make a first impression. It will make your life easier in more ways than we could ever explain here. If you do not have a mailing list to keep in touch with your prospects and customers, you are literally throwing money down the drain.
People buy things they want from people they know and trust.
And there's no better way to get people to trust you than to show them that you are an expert at what you do. Starting an email newsletter will allow you to keep in touch with your audience and do just that. With it you can keep them informed of site updates and new products. You'll never have to worry about them forgetting you because your name will always be in front of them. You can even sell advertising.