10+ Best Free WordPress Email SMTP & Delivery Plugins
- Updated: January 27, 2026
- Reading Time: 3 mins
Email plays a vital role in every WordPress site—whether it’s sending user registration confirmations, contact form submissions, password reset links, order notifications, newsletters, or admin alerts. But default WordPress emails often suffer from poor deliverability: they get marked as spam, don’t show up in inboxes, or fail silently. That’s where WordPress email SMTP and delivery plugins come in.
SMTP (Simple Mail Transfer Protocol) plugins help WordPress send email using reliable third-party mail servers instead of the default wp_mail() method. By routing email through authenticated SMTP providers (like Gmail, Sendinblue, Mailgun, or Amazon SES), you dramatically improve deliverability, reduce spam flags, and increase inbox placement.
These plugins also provide troubleshooting tools, logs, and settings to help you diagnose email problems and ensure important messages actually reach users. For business and e-commerce sites, reliable email is essential—lost order confirmations or password links lead to poor user experience and support tickets.
Many SMTP plugins support multiple delivery methods: authenticated SMTP servers, API-based delivery (fast and secure), and integration with email services that handle scalability and reputation. Even in their free versions, they often include setup wizards, logging, test email tools, and compatibility with popular contact forms (like Contact Form 7, WPForms, Gravity Forms, etc.).
WP Mail SMTP – Improve WordPress Email Deliverability
WP Mail SMTP fixes common email delivery problems by routing your WordPress emails through a reliable SMTP service instead of the default PHP mail() function. It supports major email providers like Gmail, Outlook, SendGrid, Mailgun, and many more. With an easy setup wizard and built-in mailer integrations, you can authenticate your email sender, improve deliverability, and reduce emails landing in spam. It includes email logging (in the pro version), customizable “from” name and address, and delivery tracking. This plugin is ideal for contact form notifications, user registrations, password resets, and other critical site emails.
Features
Connects WordPress to SMTP providers Supports Gmail, Mailgun, SendGrid, etc. Setup wizard for easy configuration Improves email deliverability Custom “from” name and addressPost SMTP Mailer/Email Log – Reliable SMTP Email
Post SMTP is a robust WordPress plugin that sends your site emails via SMTP, Gmail API, or other authenticated mail services to ensure reliable delivery. It includes email logging, debug tools, and fallback mailing options if the primary connection fails. The plugin supports OAuth2 authentication for Gmail and other providers that require secure login. You can also view outgoing emails in the dashboard, resend failed messages, and monitor delivery status. Post SMTP is perfect for sites that depend on contact forms, user notifications, and automated emails reaching inboxes consistently.
Features
SMTP + OAuth2 (secure login) support Email logging & resend tools Fallback mailer options Delivery status & debug tools Works with any SMTP providerMailgun – Send Emails via Mailgun API
Mailgun lets your WordPress site send emails through the Mailgun API, a powerful email service designed for reliability and scalability. Instead of relying on default mail functions, this plugin routes contact form notifications, user alerts, and transactional emails through Mailgun’s infrastructure to reduce spam filtering and improve inbox placement. You can configure domain settings, API keys, and logging for sent messages. Mailgun’s service also supports analytics and delivery tracking. This plugin is ideal for business sites, eCommerce stores, or high-traffic blogs that need consistent email performance.
Features
Sends email via Mailgun API Improved deliverability & inbox placement API key & domain configuration Email analytics & logs Works with forms & core WordPress emailsGmail SMTP – Send WordPress Emails via Gmail
Gmail SMTP allows you to configure WordPress to send your site emails through Gmail’s SMTP servers using your Google account credentials or OAuth2 authentication. This helps ensure delivery of important emails like contact form submissions, registration alerts, and password resets by using Gmail’s trusted mail infrastructure. With simple settings for sender address, ports, and secure authentication, this plugin makes Gmail SMTP accessible even for beginners. It’s useful for sites that want a free, trusted mail route without needing a third-party mail service.
Features
Sends emails via Gmail SMTP OAuth2 support for secure login Custom sender name & email Works with contact forms & core notifications Simple configuration panelSMTP Mailer – Simple SMTP Email Setup
SMTP Mailer is a lightweight WordPress plugin that configures your site to send emails through authenticated SMTP servers to improve delivery reliability. Instead of default PHP mail, this plugin lets you set SMTP host, port, encryption type, and authentication credentials so outgoing messages are more likely to reach inboxes. It’s a straightforward choice for blogs and business sites that use standard SMTP services or third-party mail providers. Easy setup and minimal settings make it beginner-friendly.
Features
SMTP host & port configuration Supports authentication credentials Encryption (TLS/SSL) support Custom sender name & email Improves email deliverabilityWelcome Email Editor – Customize New User Emails
Welcome Email Editor lets you customize the default WordPress welcome email sent to new users after registration or password reset. With an easy text editor, you can add custom greetings, branding, instructions, or links to enhance onboarding and communication. While not an SMTP plugin itself, it works well with SMTP mailers to ensure fully branded, reliable email delivery. This plugin is perfect for membership sites, eCommerce accounts, or communities that want a professional first impression via email.
Features
Customize welcome & new user emails Easy text editor interface Customize subject & content Works with SMTP plugins Improves user communicationWP Extra – Email Delivery & Enhancements
WP Extra is a WordPress extension plugin that adds email performance enhancements and tools to improve how your site sends mail. It can configure SMTP settings, optimize headers, and manage outgoing email behavior. Combined with SMTP services, WP Extra helps reduce failed delivery and spam filtering. The plugin also integrates with notification systems and email logs.
Features
SMTP configuration support Email header optimization Works with mail providers Improves delivery reliability Dashboard email toolsSAR Friendly SMTP – SMTP & Email Logging
SAR Friendly SMTP is a WordPress plugin that configures your website to send all outgoing emails through SMTP, helping avoid spam filters and improve deliverability. It includes fields to enter SMTP host, authentication, secure ports, and sender details. The plugin may also provide basic email logging so you can view sent messages in the dashboard. It’s a straightforward option for sites that need reliable email delivery using standard SMTP services without a complex setup.
Features
SMTP email routing SMTP host & authentication settings Custom sender name & address Compatible with common mail providers Simple setup panelMailjet for WordPress – SMTP via Mailjet
Mailjet for WordPress enables your site to send emails through the Mailjet email platform, a professional service with API and SMTP delivery. It improves deliverability for transactional emails like contact form alerts, user registrations, newsletters, and automatic notifications. The plugin supports Mailjet API keys, email templates, and analytics so you can track sent mail performance and opens. Mailjet’s infrastructure helps ensure your messages reach inboxes and scales well for high-volume sites.
Features
Send WordPress emails via Mailjet API & SMTP support Email templates & analytics Custom sender settings Improved deliverabilityBit SMTP – SMTP Email Setup & Delivery
Bit SMTP provides an easy interface to connect WordPress with any SMTP mail server for sending site emails. You can input SMTP host, port, encryption type, and authentication credentials to ensure outgoing messages are delivered reliably. The plugin helps avoid default PHP mail issues and reduces emails being marked as spam. It works with standard SMTP providers, mail services, and custom mail servers, making it suitable for business sites, contact forms, notifications, and user alerts.
Features
SMTP host & port configuration Supports TLS/SSL encryption Custom “from” email & name Works with major SMTP services Easy settings panelConclusion
WordPress email functionality is often overlooked—but when a site’s email fails, users notice fast. Whether it’s a missed password reset, a lost order notification, or a notification email that goes straight to spam, email deliverability directly affects professionalism, user trust, and site performance.
By default, WordPress sends mail using PHP mail, which is often unsupported or flagged on many hosting servers. This can lead to poor deliverability and unhappy users. The solution? SMTP (Simple Mail Transfer Protocol) and delivery plugins that route email through authenticated mail servers. These plugins take the guesswork out of WordPress email and ensure messages get delivered consistently.
Using SMTP through reputable providers (like Gmail, Mailgun, SendGrid, or Amazon SES) gives your mail a trusted sending reputation. Mail providers use complex filters and reputation scores to decide whether to mark a message as spam. SMTP plugins help authenticate your messages, which improves reputation and increases the likelihood that messages land in users’ inboxes—where they belong.
Delivery plugins don’t just send messages—they also help you troubleshoot and monitor email performance. Logs record every outgoing message, including success or failure status. If a user reports a missing email, logs help you trace what happened. This visibility saves time and frustration, especially for sites with lots of user interactions.
Another key advantage of SMTP plugins is improved security and authentication. Many integrate features or give instructions to set up email standards like SPF, DKIM, and DMARC. These DNS records tell receiving mail servers that your email is legitimate—significantly reducing the chance of spam flags or blocks. Without them, even SMTP messages might struggle to land in inboxes.
From a usability perspective, the best free plugins make configuration easy. Guided setup wizards help you connect your WordPress site to a mail provider, enter SMTP credentials, select ports and encryption, and test delivery in a few minutes—no developer needed. This ease of use democratizes reliable email for small businesses, nonprofits, bloggers, and e-commerce owners alike.
Compatibility matters too. Good SMTP plugins integrate with popular form builders and themes to ensure transactional emails, form submissions, newsletters, and notifications all pass through the same reliable delivery system. Some plugins also support API connections—which can be even faster and more reliable than traditional SMTP.
