Thanks, Will, but that's not what I meant. When you go into editing of those template messages you'll find many of those placeholders in curved brackets, which get substituted by actual values, when the e-mail is sent by the smtp mailer. I gave some examples in my reply above, like {NewMemberUrl}, {site_name}, and many more. Just wanted to know, if there is a list of those and especially, if there is also a placeholder for the site_logo.