Newsletter Archive puts the email newsletters you have already sent on a page of your site, newest first. Each one links to its own web version, so a parent who missed October's update or a customer who deleted last month's letter can read it again. Add the widget and it fills itself from your email campaigns. When you send the next one, it shows up there too.
Only published campaigns appear. Drafts, templates, archived campaigns and automated emails stay off, and so does any campaign whose title starts with [private]. Open rates and other statistics are never read or shown.
You can change the heading and the line under it, choose how many issues show, turn dates on or off, rename the Read link and pick a font. Add a Subscribe button that points to your sign-up page or form. On phones the list stacks neatly.
The free plan shows your newest six newsletters as a list with a small credit link under it. Premium shows every issue with a Show more button, cards with the first image of each email, a banner for the latest issue, a search box, groups by year or month, a list to hide single issues, three more colour themes and your own accent colour, and it removes the credit link.