Title: Lettr – Email API Author: vojtechj Published: 19 Tháng 5, 2026 Last modified: 27 Tháng 5, 2026 --- Tìm kiếm plugin ![](https://s.w.org/plugins/geopattern-icon/lettr.svg) # Lettr – Email API Bởi [vojtechj](https://profiles.wordpress.org/vojtechj/) [Tải về](https://downloads.wordpress.org/plugin/lettr.1.1.0.zip) * [Chi tiết](https://vi.wordpress.org/plugins/lettr/#description) * [Đánh giá](https://vi.wordpress.org/plugins/lettr/#reviews) * [Cài đặt](https://vi.wordpress.org/plugins/lettr/#installation) * [Nhà phát triển](https://vi.wordpress.org/plugins/lettr/#developers) [Hỗ trợ](https://wordpress.org/support/plugin/lettr/) ## Mô tả Send transactional and marketing emails from your WordPress site using the [Lettr](https://lettr.com) email API. Lettr replaces the default WordPress email system with a reliable, developer- friendly API that delivers emails to inboxes — not spam folders. #### Why Lettr? * **Reliable email delivery** — Built on battle-tested infrastructure with SPF, DKIM, and DMARC authentication out of the box. * **Simple setup** — Connect your WordPress site with a single API key. No SMTP configuration needed. * **Transactional email at scale** — Send password resets, order confirmations, notifications, and more through the Lettr email API. * **Real-time tracking** — Monitor opens, clicks, bounces, and deliverability from the Lettr dashboard. * **Templates & personalization** — Use the Lettr drag-and-drop editor and merge tags for dynamic content. * **Developer-first** — RESTful API, detailed documentation, and SDKs for PHP, Node.js, Python, Go, Rust, Java, and Laravel. #### How it works This plugin overrides the default WordPress `wp_mail()` function and routes all outgoing emails through the Lettr API. This means every email your site sends — including emails from WooCommerce, contact form plugins, and any other plugin — is delivered through Lettr automatically. #### Links * [Lettr Website](https://lettr.com) * [Documentation](https://docs.lettr.com) * [API Reference](https://docs.lettr.com/api-reference/introduction) ### External services This plugin connects to the Lettr API at `app.lettr.com` to deliver email on behalf of your WordPress site. Each time `wp_mail()` is invoked, the plugin sends the following data to Lettr over HTTPS so that Lettr can process and deliver the message: * The configured sender email address and name * Recipient, CC, BCC, and Reply-To addresses * The email subject, HTML and/or plain text body, and any attachments * Any custom email headers, tags, or metadata supplied by the calling code * Your Lettr API key (sent as a Bearer token in the `Authorization` header for authentication) The plugin also calls `app.lettr.com/api/auth/check` to validate the API key when you save it on the settings screen. This service is provided by Lettr. By using this plugin you agree to Lettr’s terms and acknowledge their privacy practices: * Terms of Service: [https://lettr.com/terms](https://lettr.com/terms) * Privacy Policy: [https://lettr.com/privacy-policy](https://lettr.com/privacy-policy) ## Cài đặt 1. Upload the plugin to `/wp-content/plugins/lettr` or install via the WordPress plugin installer. 2. Activate the plugin through the **Plugins** menu. 3. Go to **Settings Lettr** and enter your API key from the [Lettr dashboard](https://lettr.com). 4. Configure your sender name and email address. 5. Send a test email to verify everything is working. ## Hỏi đáp ### Do I need a Lettr account? Yes. Sign up for free at [lettr.com](https://lettr.com) to get your API key. ### Does this work with WooCommerce? Yes. Lettr handles all emails sent via the standard WordPress `wp_mail()` function, which includes WooCommerce order confirmations, shipping notifications, and customer emails. ### Do I need to configure SMTP? No. Lettr uses a REST API instead of SMTP, which means there are no ports to open or SMTP credentials to manage. ### Where can I find my API key? Log in to your account at [lettr.com](https://lettr.com) and navigate to the API Keys section. ## Đánh giá Không có đánh giá nào cho plugin này. ## Người đóng góp & Lập trình viên “Lettr – Email API” là mã nguồn mở. Những người sau đã đóng góp vào plugin này. Những người đóng góp * [ vojtechj ](https://profiles.wordpress.org/vojtechj/) [Dịch “Lettr – Email API” sang ngôn ngữ của bạn.](https://translate.wordpress.org/projects/wp-plugins/lettr) ### Muốn tham gia phát triển? [Duyệt code](https://plugins.trac.wordpress.org/browser/lettr/), check out [SVN repository](https://plugins.svn.wordpress.org/lettr/), hoặc theo dõi [nhật ký phát triển](https://plugins.trac.wordpress.org/log/lettr/) qua [RSS](https://plugins.trac.wordpress.org/log/lettr/?limit=100&mode=stop_on_copy&format=rss). ## Nhật ký thay đổi #### 1.1.0 * Add audience API client methods (lists, contacts, topics, properties, segments). * Bump tested-up-to to WordPress 7.0. #### 1.0.0 * Initial release. ## Meta * Phiên bản **1.1.0** * Cập nhật lần cuối **3 ngày trước** * Số lượt cài đặt **Ít hơn 10** * Phiên bản WordPress ** 5.8 hoặc cao hơn ** * Đã kiểm tra lên đến **7.0** * Phiên bản PHP ** 7.2 hoặc cao hơn ** * Ngôn ngữ * [English (US)](https://wordpress.org/plugins/lettr/) * Thẻ * [email](https://vi.wordpress.org/plugins/tags/email/)[Email API](https://vi.wordpress.org/plugins/tags/email-api/) [smtp](https://vi.wordpress.org/plugins/tags/smtp/)[transactional email](https://vi.wordpress.org/plugins/tags/transactional-email/) * [Nâng cao](https://vi.wordpress.org/plugins/lettr/advanced/) ## Đánh giá Chưa có đánh giá nào được gửi. [Your review](https://wordpress.org/support/plugin/lettr/reviews/#new-post) [Xem tất cả đánh giá](https://wordpress.org/support/plugin/lettr/reviews/) ## Những người đóng góp * [ vojtechj ](https://profiles.wordpress.org/vojtechj/) ## Hỗ trợ Có điều gì muốn nói? cần giúp đỡ? [Xem diễn đàn hỗ trợ](https://wordpress.org/support/plugin/lettr/)