內容簡介
FluentSMTP 是一款免費的 WordPress SMTP 外掛，旨在提高電子郵件的送達率。它通過選擇的電子郵件服務提供商（如 Gmail、Amazon SES 等）來路由所有 wp_mail() 調用，確保您的郵件快速送達收件箱，而非垃圾郵件。
【主要功能】
• 支援多種電子郵件服務提供商
• 自訂發件人名稱與電子郵件
• 電子郵件日誌與失敗警報功能
• 根據發件人地址自動路由郵件
• 100% 免費且開源，無付費版本
外掛標籤
開發者團隊
② 後台搜尋「FluentSMTP – WP Mail SMTP Plugin with Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, toSend, Gmail and Any SMTP」→ 直接安裝（推薦）
📦 歷史版本下載
原文外掛簡介
WP Mail SMTP Plugin for Any Email Service Provider
Are your WordPress emails not sending, landing in spam, or failing silently? FluentSMTP is a free WordPress SMTP plugin that fixes email deliverability by routing every wp_mail() call through the email service you choose: Gmail, Google Workspace, Amazon SES, SendGrid, Mailgun, Cloudflare Email, toSend, Postmark, Brevo (Sendinblue), SparkPost, Netcore, Elastic Email, SMTP2GO, Outlook / Office 365, Zoho, or any SMTP host.
FluentSMTP talks to each provider’s own API rather than only SMTP, so your transactional and marketing email goes out quickly and lands in the inbox. Set your From name and email, turn on email logging, add failure alerts, and route different senders to different providers, all from one screen.
Connect as many email services as you want, and FluentSMTP routes each email to the right one based on its From address.
💚 100% Free Forever — No Pro Version, No Upsells, No Paywalls 💚
FluentSMTP is 100% free and open source, and it always will be. There is no “pro” version, no premium add-ons, no locked features, no email capture wall, no nagging upgrade prompts, no feature limits, and no paid tier. Every integration listed here, from Amazon SES, Gmail and Outlook to SendGrid, Mailgun, Cloudflare, toSend, Postmark, Brevo and SparkPost, is fully available at no cost.
You will never have to pay a cent to use any feature of FluentSMTP. We have pledged this as part of our “Five for the Future” participation, an initiative started by the WordPress Foundation.
Our parent company WPManageNinja LLC builds commercial products for WordPress businesses and runs a stable, profitable business on those, which means FluentSMTP is our way of giving back to the WordPress community, not a funnel. 👉 Read why it’s 100% free (always) 👈
🎉 Supported Email Service Providers and SMTP Connections
Amazon SES (API)
Gmail (OAuth API)
Google Workspace (OAuth API)
Outlook / Office 365 / Microsoft 365 (OAuth API)
SendGrid (API)
Mailgun (API)
Cloudflare Email Sending (API)
toSend (API)
Brevo, formerly Sendinblue (API)
Netcore, formerly Pepipost (API)
Postmark (API)
SparkPost (API)
SMTP2GO (API)
Elastic Email (API)
Zoho Mail (SMTP)
PHP mail()
Any SMTP server: your web host, Gmail SMTP, Yahoo, Outlook.com, Yandex and more
More native integrations coming soon
🎉 FluentSMTP Features
FluentSMTP is built for speed, reliability and scale.
Real-time email delivery over each provider’s API
Email routing across multiple email connections
Connect any email service provider or SMTP server
Fallback email connection when the primary one fails
Email logging with full headers, body and server response
Resend any logged email to any recipient
Detailed email reporting and charts
Daily connection health monitoring
Failure alerts via Telegram, Slack, Discord and Pushover
WP-CLI support
A fast, modern admin with a dark theme
Most importantly, this plugin is free and will always be free.
👉 Read why it’s 100% free (always) 👈
How does FluentSMTP work?
Like any WP mail SMTP plugin, FluentSMTP replaces the WordPress wp_mail() function and hands every email to the service you connected, using that service’s own API where one exists, or the SMTP host, port and credentials you gave it for a plain SMTP connection. Every plugin and theme that sends email through wp_mail() is covered, with nothing to change on their side.
Email Logging and Debugging
FluentSMTP logs every email your WordPress site sends, so you can check at any time what went out, what did not, and what the mail server said about it. Failed emails can be retried, and any logged email can be resent.
🎉 Amazon SES (Native API Connection)
The Amazon SES connection sends your WordPress email through Amazon’s low-cost, high-deliverability infrastructure, set up in a couple of minutes. It uses Amazon’s current SES API and supports every SES region, including the EU Sovereign Cloud.
The SES client reuses its cURL connection across sends, so a burst of emails does not pay for a new handshake each time.
🎉 Gmail or Google Workspace (Native API Connection)
Connect your Gmail or Google Workspace account and send WordPress email over Google’s API rather than Gmail SMTP. The connection uses OAuth, so there is no app password to create or store.
🎉 SendGrid API Connection
SendGrid runs a globally distributed sending platform, and the SendGrid API connection takes about a minute to set up.
Read the SendGrid connection documentation
🎉 Mailgun Email API Connection
Mailgun is a leading email sending service trusted by 225,000+ businesses. You can rely on their globally distributed, cloud-based architecture for sending your WordPress emails.
The Mailgun connection takes about a minute to set up, and it uses their API rather than SMTP.
Read the Mailgun connection documentation
🎉 Brevo (formerly Sendinblue) API Connection
Brevo is a platform for growing businesses with a strong transactional email service. They serve more than 80,000 companies around the world and send millions of emails every day.
If you use Brevo, FluentSMTP connects to its API and sends your WordPress email through it.
Read the Brevo connection documentation
🎉 Netcore (formerly Pepipost) Email API Connection
Netcore is a complete email sending partner with a user-friendly dashboard, statistics and real-time delivery information.
The Netcore connection takes about a minute to set up, and it uses their API rather than SMTP.
Read the Netcore API connection documentation
🎉 SparkPost Email API Connection
SparkPost is a reliable email sending service with detailed analytics. The SparkPost connection takes about a minute to set up.
Read the SparkPost connection documentation
🎉 Postmark API Connection
Postmark is a highly reliable transactional email service, known for fast delivery and top-tier inbox placement. FluentSMTP connects to Postmark’s Server API directly: paste your Server Token, pick a Message Stream, and your transactional email goes through Postmark, with attachments, CC/BCC, Reply-To and custom headers all carried across.
Read the Postmark connection documentation
🎉 Elastic Email API Connection
Elastic Email handles both transactional and marketing mail, with per-message statistics in its dashboard. FluentSMTP uses their official API.
🎉 Outlook / Office 365 / Microsoft 365 API Connection
Connect your Outlook.com, Office 365 or Microsoft 365 account and send WordPress email over Microsoft’s Graph API. The connection uses OAuth2, so no password is stored on your site, and single-tenant Entra app registrations are supported.
Read the documentation for connecting Office 365 email with WordPress
🎉 SMTP2GO Email API Connection
SMTP2GO handles both transactional and marketing mail, with per-message statistics in its dashboard. FluentSMTP uses their official API.
🎉 Cloudflare Email API Connection
Send WordPress emails through Cloudflare Email Sending using their native REST API. If your domain is already on Cloudflare, you can send transactional email directly from Cloudflare’s edge network, fast, reliable, and with built-in SPF/DKIM/DMARC. FluentSMTP handles the full request shape, including attachments, CC/BCC, Reply-To, and custom headers. The API token is checked when you save it and again on the connection screen, so a bad token is reported before an email needs it.
🎉 toSend Email Sending Provider
toSend is a modern transactional email service with a simple API, per-domain analytics, and fast delivery. FluentSMTP ships a native toSend integration: paste your API key, set a verified From address, and you’re sending in under a minute. Failed sends are logged with full payloads so you can resend or debug without leaving WordPress.
Read the toSend WordPress setup guide
🎉 Any SMTP Server
FluentSMTP works with any service that offers an SMTP connection, including your web host’s mail server, Gmail SMTP, Yahoo, Outlook.com, Zoho Mail and Yandex Mail.
You can set the following options:
Specify an SMTP host.
Specify an SMTP port.
Choose the encryption (SSL or TLS).
Choose whether to use SMTP authentication.
Specify the SMTP username and password.
That’s it 💯
Read the SMTP connection documentation
🚀 A Fast, Modern Admin 🚀
Built with Vue 3 as a single-page application, with a light and a dark theme.
A lean interface that needs no learning curve.
A dashboard with charts and stats showing how your email is doing.
🚀 Automatic Email Routing 🚀
Add as many email connections as you want. FluentSMTP routes each email to the right one based on its From address.
Route your transactional emails through one connection and your marketing emails through another, or set a fallback connection that takes over when the primary one fails.
🚀 Email Logs and Reporting 🚀
Want to know how much mail your site is sending, and what it is? The email log lists every email, with charts of the daily totals, and you can resend any of them at any time. It is useful for keeping a record, auditing what goes out, and debugging while you build.
You can turn logging off, in which case only failed emails are recorded. Logs live in their own database table, so your WordPress tables stay as they are.
🚀 Connection Health Monitoring 🚀
An expired OAuth token or a removed API key stays invisible until the first email that needed it fails. FluentSMTP checks every connection once a day, shows failures on the dashboard, and notifies you over your configured notification channels the moment a connection starts failing. Only newly broken connections notify, so a known issue will not nag you every day.
🚀 WP-CLI Support 🚀
Manage FluentSMTP from the terminal, which matters most when the emails you need are the ones getting you into the admin:
wp fluent-smtp test – send a test email through any connection
wp fluent-smtp health – check every connection
wp fluent-smtp stats – sent and failed counts
wp fluent-smtp prune-logs – clean up old email logs
🚀 Real-time Notifications on Email Failures via Telegram, Slack, Discord and Pushover 🚀
Connect Telegram, Slack, Discord or Pushover, as many as you want at once, and FluentSMTP messages you there the moment an email fails to send, so you find out before your customers do.
🚀 Security 🚀
FluentSMTP is built with security and scale in mind, and gives you several ways to keep your credentials and your sending safe.
Store your SMTP and API credentials in wp-config.php instead of the database.
Credentials kept in the database are encrypted.
Auto-delete old email logs after the number of days you choose.
Connections use each provider’s API directly, over OAuth where the provider offers it, so no password needs to be stored where a token will do.
🚀 Plain-Text Version of HTML Email 🚀
FluentSMTP can convert your HTML email to plain text as it sends, and deliver both parts as a multipart message. This helps deliverability and your spam score. Turn it on in the settings.
👉 Credits 👈
FluentSMTP is built by WPManageNinja LLC, the team behind Fluent Forms, FluentCRM and Ninja Tables.
FluentSMTP is free and open source, and we will never release a pro version. That is not a feature gap: everything the plugin does is in the free version. We wrote an article about why we made it and where we are taking it.
The full source code is on GitHub, and contributions are welcome.
👉 View on GitHub 👈
Compatible With
Fluent Forms – The Fastest Form Builder Plugin
FluentCRM – Email Marketing Automation, Email Newsletter and CRM Plugin for WordPress
WooCommerce
Elementor Forms
Contact Form 7
Gravity Forms
WPForms Lite and WPForms Pro
Forminator – Contact Form
Ninja Forms Contact Form
Form Maker by 10Web
Formidable Form Builder
GiveWP – Donation Plugin
Fast Secure Contact Form
Visual Forms Builder
Contact Form Builder
PlanSo Forms
SendPress Newsletters
WP HTML Mail
Email Templates
… and every other plugin that sends mail through the WordPress wp_mail() function.
Easy Migration from WP Mail SMTP by WPForms
Moving from WP Mail SMTP by WPForms takes a few seconds.
Install and activate FluentSMTP on your site.
Go to Settings -> FluentSMTP.
It will automatically detect your existing configuration from “WP Mail SMTP by WPForms”.
Click the “Import From WP Mail SMTP” button and that’s it.
Deactivate “WP Mail SMTP by WPForms” and enjoy FluentSMTP.
One Click Migration from Easy WP SMTP
Moving from Easy WP SMTP takes a few seconds.
Install and activate FluentSMTP on your site.
Go to Settings -> FluentSMTP.
It will automatically detect your existing configuration from “Easy WP SMTP”.
Click the “Import From Easy WP SMTP” button and that’s it.
Deactivate “Easy WP SMTP” and enjoy FluentSMTP.
What’s Next
If you like this plugin, then consider checking out our other plugins:
FluentCRM – Email Marketing Automation and CRM Plugin for WordPress
Fluent Forms – Fastest WordPress Form Builder Plugin
Fluent Support – WordPress Helpdesk and Customer Support Ticket Plugin
Ninja Tables – Best WP DataTables Plugin for WordPress
Ninja Charts – Best WP Charts Plugin for WordPress
Paymattic – Simple Payment Donations & Subscriptions Plugin
