FluentSMTP

100% free, feature-rich SMTP plugin supporting multiple mailers, fallback routing, and real-time delivery tracking.

• Official Website: fluentsmtp.com
• Primary Category: Email Newsletters & Marketing Automation
• License / Pricing: Free

Overview

FluentSMTP is an open-source, completely free SMTP mailer plugin for WordPress created by WPManageNinja. It delivers enterprise capabilities—including multiple active connections, smart fallback failover, email logging, and resend tools—without paid tiers or upsells.

Key Features

• 100% free with zero premium upsells or gated delivery features
• Direct API support for Amazon SES, SendGrid, Mailgun, Postmark, Brevo, and Google Workspace
• Multi-connection routing: route marketing emails through Amazon SES and transactional through Postmark
• Searchable email logs with one-click resend and detailed dispatch failure diagnostics

Developer Usage & Code Examples

// Custom email routing filter with FluentSMTP
add_filter( 'fluentsmtp_selected_connection', function( $connection, $email_data ) {
    if ( strpos( $email_data['subject'], 'Receipt' ) !== false ) {
        return 'postmark'; // Route receipts through dedicated transactional sender
    }
    return $connection;
}, 10, 2 );

Tags & Taxonomy