Letterness – Newsletter Popup, Signup Forms & Built-in Email Sending

Yes. Every feature described here is free: signup forms, unlimited subscribers stored in your own database, newsletter sending, automations and reports. There is no per-subscriber pricing.

No. Letterness stores subscribers in your own WordPress database and sends through wp_mail() . For higher deliverability on larger lists we recommend a free SMTP plugin such as WP Mail SMTP or FluentSMTP, which Letterness works with automatically.

Yes. Upload a CSV, map the columns, choose a list and review the preview. Letterness skips duplicates, flags invalid addresses and runs the import in steps so large files do not time out. You will be asked to confirm that you have permission to email the people you import.

Yes. Pick one or more lists, then narrow the audience with tag, language and custom field rules. A recipient count shows how many people will receive the campaign before you send.

Yes. Turn on the welcome automation and choose to send immediately or after a delay in minutes, hours or days.

Yes. New-post notifications can send instantly on publish or collect posts into a scheduled daily or weekly digest, filtered by post type and category.

Yes. Paste one or several article links and Letterness builds an editable article block for each, with the title, featured image and summary. You can also pull recent items from an RSS or Atom feed.

Yes, with the subscriber’s consent. Each campaign shows opens, clicks, unique counts, rates and the most-clicked links, and subscribers can choose no tracking, anonymous totals, or individual tracking. Open tracking is approximate, since many email apps block or preload images. Click tracking is exact.

Every email has a visible, signed one-click unsubscribe link and standards-based List-Unsubscribe headers, so inbox providers can show a native unsubscribe button. A secure preference link also lets subscribers update their details and lists. Unsubscribing shows a confirmation page and immediately suppresses the address.

Letterness includes an optional consent checkbox with your own wording and privacy policy link, records the consent text with each signup, supports double opt-in, and never sells or shares data. Analytics store a one-way hash of the email rather than the address itself. You remain responsible for your own compliance, so check the rules that apply to you.

Yes. Signup forms include an invisible honeypot and per-address and per-IP rate limits, and you can block specific email addresses or domains. No CAPTCHA or third-party script is loaded.

Yes. Colors, image, shape, size and animations each have an optional mobile override, so desktop and mobile can look completely different. One size control scales every element responsively.

Yes. The popup shows via JavaScript and the form block is server-rendered, so it works with classic and block themes, Elementor, Gutenberg and caching plugins. Use the shortcodes or the block to place forms anywhere.

Yes. The popup is a keyboard-accessible dialog: focus moves into it on open and back on close, focus is trapped inside, Escape closes it, controls are labeled for screen readers, and reduced-motion and RTL are supported.

Yes. Letterness Pro is a separate paid plugin with A/B testing, advanced targeting, advanced automations and drip sequences, conditional content and smart segments, and priority support. The free plugin stays fully functional on its own. You can see the plans on the Letterness Pro page .

Yes. Free and Pro use the same settings and the same subscriber, newsletter and analytics tables in your own database, so switching in either direction keeps everything. Pro-only data simply stays dormant while you are on Free and comes back if you upgrade again. Deleting Free while Pro is installed never removes your data.

Nothing is deleted by default. Your subscribers, newsletters, analytics and settings stay in your database when you delete the plugin, so you can reinstall it or upgrade to Letterness Pro and pick up exactly where you left off. If you want a full clean-up, tick “Delete all Letterness data when the plugin is deleted” in Letterness > General & Triggers before deleting. That removes the settings, the subscriber, newsletter and analytics tables, import data and any scheduled events, and it cannot be undone.