Why do people use email for business communication? Because it saves time, physical effort, expense, and helps avoid telephone tag. But isn’t it an informal way of communicating? Yes. And some people think informal means sloppy. Not so, says Gregg Reference Manual, “business communications are business communications, no matter how they are sent.…”
Even if it’s okay to write informally, it’s smart to remember grammar, usage, and style. If you’re writing for yourself on a personal basis, anything goes. If, however, you’re writing for an organization, play by its rules. Be aware that anything you write for your business may some day be used in a legal action. Be careful.