Buttondown Documentation
It's handy to be able to preview how an email looks in an actual email inbox. For this, Buttondown lets you send draft emails to yourself (and others!) for review.
While editing an email, open the preview pane and click the "Send draft" button located at the top:
You'll be presented with a dialog allowing you to specify which subscribers you want to send a draft copy to.
To send a draft copy to yourself, add your own email address as a subscriber to your newsletter. You can then add tags or "gift" yourself a premium subscription to get a preview of how the email will look like for a certain audience.
You can send a draft copy to any email address without adding them anas a subscriber. However, you won't be able to test various configuration that way. You can add them by entering the email address into the search box.