Letterness is a complete, self-hosted newsletter toolkit for WordPress. Collect subscribers with a customizable popup, a sidebar signup card, and a header menu button, then compose and send newsletters to your list directly from your dashboard. No third-party account required.

Everything is controlled from a single settings screen, and the popup can be styled independently for desktop and mobile.

Capture subscribers three ways

A responsive popup with delay, scroll-depth, or exit-intent triggers.
A sidebar signup card you can drop into any widget area or place with a shortcode.
A subscribe button that injects into a theme menu location or appears via shortcode.

Design control

Separate desktop and mobile colors, image, shape, dimensions, and animations.
Six popup layouts (split, stacked, minimal, circle, hexagon, octagon).
Ten entrance animations plus badge and screen-transition effects.
Live in-dashboard preview at desktop and mobile viewport sizes.

Built-in sending

Compose newsletters with the standard WordPress editor.
Save drafts, schedule for later, or send immediately.
Batched delivery through your site’s normal wp_mail() pipeline.
Automatic, one-click unsubscribe link on every email.
Customizable from-name, from-address, and email design.

Subscriber management

View your subscriber list in the dashboard.
Export all subscribers to CSV.
Remove subscribers individually.

Shortcodes

[letterness_subscribe_button] places the subscribe button anywhere.
[letterness_card] places the signup card anywhere.

For large lists or better inbox placement, pairing Letterness with an SMTP plugin (such as WP Mail SMTP) is recommended.