The Mail Letter service is an awesome feature with a great price tag, but we don't use it only because we can't send our letters to people in our community that haven't signed up on the website. It would be great if admins could specify addresses within their communities regardless of whether or not those addresses have signed up on the website, that way we could still mail letters to those addresses. Obviously you wouldn't know "who" to address the letters to so you could just put something generic like "Current Resident". I'm sure HOA Express is missing out on a ton of revenue because of this!