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” On the menu at the left side of the dashboard, hover over MailPoet>Newsletters.  On the page, this is next to "What type of newsletter is this?" On the "Automatically sent…" line, click the dropdown and select, "When a new WordPress user is added to your site." The next dropdown will let you select what level of user will receive the newsletter (i.e. subscriber, contributor, editor, administrator, or any), and on the next dropdown, select when will the new user receive this email. On the next line, add your "Subject." There are no dynamic tokens for this type of message, so whatever the subject is will be as you write it. Editing the email is the same as listed above, EXCEPT you may also select a particular post or page to add to this email by clicking and dragging the "WordPress post" bar into the email, in the box to the right of the template. If you want to add a particular post or page, go to the next step, otherwise skip to step 9. Click and drag the "WordPress post" widget bar into your email. A dialog box will open.  At the top left of it you may select whether you’re adding a post or a page, then you may filter by category and whether it’s published or not. In the box below, select which post or page you’d like added to this email, and then click ‘Insert selected’ at the bottom right of the dialog box. When you’re happy with the appearance of your email, click "Next Step" at the bottom of the page. On the "Final step: last details" page, you will have the opportunity to review everything you did.   Enter your email address in the text box, and click the "Send preview" button. Check your email, and make sure your email looks like you expect it should. Click "Activate Now" and you have an automatic email that sends a message when your WordPress site is updated.
Log in to your WordPress dashboard. Go to “Newsletters. Click the "Create a new email" button. Select the “Automatic newsletter” radio button. Select New WordPress user. Set your Subject line. Edit the email. Add a post/page. Click Next. Review. Edit Sender. Enter the name and email address to which subscribers will be sending if they reply. Preview. Activate.