Keep your sentences and paragraphs short and sharply focused. Ask for action . Be clear and explicit about what you want your reader to do. Be accessible . Make it easy for your reader to respond to your idea, ask for your service, or purchase your product.
Tone is important to achieving a cordial close.
If you have any questions, please call me. The first grants permission. The second extends an invitation. Be correct . Let the writing rest a while before you review it through the reader's eyes.