I've pushed a new feature, hashtag footers. Each hashtag can now have a footer. If a hashtag has a footer, then all emails tagged with that hashtag will have the footer inserted into the top of the message footer (for single messages), or right after the message body (for digest messages). Also, if composing a message using the New Topic page and you select a hashtag using the `Add Tags` dropdown that has a footer, the footer is displayed on the page.
This was requested by an enterprise group that wished to provide additional guidance for people responding to particular emails.
Please let me know if you have any questions or suggestions.