內容簡介
Letterness 是一款完整且免費的 WordPress 通訊和電子郵件行銷外掛，幫助用戶透過可自訂的彈出視窗、側邊欄卡片和內嵌表單來增長電子郵件名單，並在控制台中管理訂閱者及發送通訊。
【主要功能】
• 自訂彈出視窗和表單設計
• 訂閱者管理與標籤功能
• 內建電子郵件發送與自動化
• CSV 匯入匯出功能
• 偏好中心供訂閱者更新資訊
• 支援多種佈景主題與 SMTP 外掛
外掛標籤
開發者團隊
② 後台搜尋「Letterness – Newsletter Popup, Signup Forms & Built-in Email Sending」→ 直接安裝（推薦）
原文外掛簡介
Letterness is a complete, free newsletter and email marketing plugin for WordPress. Grow your email list with a customizable popup, sidebar card and inline forms, manage your subscribers, then write and send newsletters from your dashboard. There is no third-party account, no monthly fee and no subscriber limit, and your list stays in your own database.
Letterness is designed, developed and maintained by Kamran Kazmi, the creator and owner of the plugin.
Most newsletter plugins make you choose: a nice opt-in popup from one plugin, sending from a paid service, automations behind a paywall. Letterness puts signup forms, subscriber management, email sending, automations and reporting in one lightweight plugin, controlled from a single screen. A guided setup wizard gets your first popup live in a couple of minutes.
Why choose Letterness?
Free and self-hosted. No SaaS account, no per-subscriber pricing, no contact limits. You are only limited by what your host can send.
All-in-one. Capture, manage, send, automate and measure without stitching plugins together.
Lightweight. Front-end CSS and JavaScript load only on pages where they are used.
Privacy-conscious. Optional consent checkbox, double opt-in, a subscriber preference center, and tracking that is off unless a subscriber agrees to it.
Works with your setup. Classic and block themes, Gutenberg, Elementor, page caches and any SMTP plugin.
Newsletter popup and signup forms
A responsive newsletter popup in six shapes: circle, hexagon, octagon, minimal, split and stacked.
Triggers: after a delay, after scrolling a set percentage, or on exit intent, with a “don’t show again for” period.
Independent mobile and desktop design: colors, shape, size and animations each have an optional mobile override, and one size control scales every element.
Solid or gradient backgrounds, custom colors, headline, button text, image and entrance animations.
Targeting: show everywhere or only on the front page, posts or pages, hide on chosen URLs and on WooCommerce cart and checkout, and show on desktop, mobile or both.
A sidebar signup card for any widget area, a header subscribe button for your menu, and an inline form with a shortcode, a Gutenberg block, or automatic placement above, below or inside your content.
Clear “you’re already subscribed” feedback for existing subscribers.
Optional “Powered by Letterness” credit, off unless you turn it on.
Subscribers and audience
Lists, tags and custom fields, with filters and bulk actions.
Statuses for active, pending, unsubscribed and bounced contacts.
CSV import with a preview, column mapping, list assignment, duplicate skipping and a resumable, step-by-step run, plus CSV export that is safe to open in spreadsheets.
Preference center: subscribers use a secure link in each email to update their name, lists, profile fields and language, or to pause by clearing all lists. Email address changes are confirmed at the new address.
Optional double opt-in with expiring, one-time confirmation links and a resend option.
Spam protection: invisible honeypot, signup rate limits, an optional block list for addresses and domains, and fresh security tokens so cached pages keep working.
Optional Contact Form 7 connector that subscribes a person only when they tick a Letterness consent box.
Send newsletters from WordPress
A block composer with text, image, button, divider and article blocks, plus an optional HTML editor, live desktop and mobile preview, autosave, and the last 10 versions of each campaign to restore.
Ten responsive email templates (newsletter, blog digest, announcement, welcome, product, simple, minimal, magazine, holiday, featured) and up to 30 reusable templates of your own.
Add articles by URL: paste one or several links and Letterness fetches each title, featured image and summary into an editable article block. You can also pull the latest items from an RSS or Atom feed.
Campaign audiences: send to one or more lists and narrow them with tag, language and custom field rules, with a recipient count preview before you send.
Personalization merge tags such as {first_name|there}, {site_name} and {unsubscribe_url}, with fallbacks so blank values never look broken.
Save drafts, schedule for later or send now, with throttled batch delivery, a live delivery queue and test emails.
Optional UTM tags added to the links in your campaigns.
Sends through WordPress wp_mail(), so any SMTP plugin (WP Mail SMTP, FluentSMTP, Post SMTP and others) works automatically.
Automations
Welcome email when someone subscribes, immediately or after a delay you choose.
New-post notifications that email your subscribers when you publish, instantly or as a daily or weekly digest, filtered by post type and category.
Reports
Subscriber growth chart and a breakdown by signup source.
Campaign reports showing how many messages your mailer accepted and how many failed, plus opens, clicks, unique counts, rates and top links, with a CSV export.
Consent-aware tracking: subscribers choose no tracking, anonymous totals only, or individual tracking. Open tracking is approximate by nature, click tracking is exact.
Deliverability and compliance
Visible unsubscribe link plus List-Unsubscribe and one-click unsubscribe headers (RFC 8058), so Gmail and Yahoo can show a native unsubscribe button.
Branded unsubscribe confirmation page, re-subscribe option and instant suppression.
GDPR-style consent checkbox with your own wording and privacy policy link, recorded with each signup.
Built for everyone
A keyboard-accessible popup with focus management and Escape to close, reduced-motion support and RTL layouts.
Translation-ready.
Your data is yours: nothing is deleted when you remove the plugin unless you tick the clean-up option first.
Go further with Letterness Pro
Everything above is free, with no locked features and no trial limits. If you want to grow faster, Letterness Pro is a separate paid plugin that replaces the free one and keeps all your settings, subscribers and newsletters. It adds:
A/B testing for popups and subject lines, so you can see what actually converts.
Advanced targeting and trigger rules to show the right popup to the right visitor.
Advanced automations and drip sequences that go beyond a single welcome email.
Conditional content and smart segments for more relevant emails.
Priority support and premium templates.
Plans start at $5 per month, or $50 per year for one site. See Letterness Pro.
Shortcodes
[letterness_form] – inline signup form.
[letterness_card] – sidebar signup card.
[letterness_subscribe_button] – subscribe button.
For the best inbox placement on larger lists, pair Letterness with a free SMTP plugin.
