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WordPress uses the PHP mail() function by default, which often results in emails being marked as spam or not delivered at all. Frumbik SMTP replaces the default mail function with authenticated SMTP or API-based email delivery through your chosen provider.
Connect Gmail, SendGrid, Amazon SES, or any SMTP server — and all emails WordPress sends will be properly authenticated, encrypted, and delivered.
Key Features
Frumbik SMTP provides the following capabilities, all included in the free version:
🔄 Automatic Failover — If your primary provider goes down, emails automatically route to your backup provider.
📊 Dashboard — Real-time delivery stats, success rates, and charts. See what is happening with your emails at a glance.
📋 Complete Email Log — Every email logged with status, timestamps, headers, and source plugin. Search, filter, resend, or export — all from one screen.
🔐 Strong Security — AES-256-CBC encryption for all credentials. Security scoring dashboard with actionable recommendations.
⚡ Background Queue — High-traffic site? Queue emails for async delivery so your pages load fast while emails send in the background.
🎯 Smart Routing — Route WooCommerce emails through SendGrid, contact forms through Mailgun, and newsletters through Amazon SES — all automatically.
9 Providers, One Plugin
Connect to any email service without installing separate add-ons:
Other SMTP — Any SMTP server (Gmail, Outlook, Yahoo, your hosting, custom servers)
SendGrid — Transactional email API by Twilio
Mailgun — Email API by Sinch
Postmark — Transactional email delivery by ActiveCampaign
Brevo (formerly Sendinblue) — Marketing and transactional email
SparkPost — Email delivery by MessageBird
Amazon SES — AWS Simple Email Service (v2 API with Signature v4)
Microsoft 365 / Outlook — Microsoft Graph API with OAuth 2.0
Gmail API — Google Gmail API with OAuth 2.0
All providers are included in the plugin.
Core Features
📨 Reliable Email Delivery
Replace WordPress’s unreliable wp_mail() with authenticated SMTP or native API connections
Supports TLS and SSL encryption protocols
Proper SPF, DKIM, and DMARC alignment through your provider
Works with any WordPress theme, plugin, or page builder
📋 Comprehensive Email Logging
Every outgoing email logged automatically — sent, failed, or queued
Full details: recipients, subject, body, headers, attachments, timestamps
Automatic source detection — know which plugin triggered each email
One-click resend for failed or bounced emails
CSV export with advanced search and filtering
Configurable log retention (auto-cleanup old logs)
🔄 Multi-Connection & Failover
Configure multiple mail providers simultaneously
Automatic failover — if Provider A fails, Provider B takes over instantly
No manual intervention needed. No lost emails during outages.
Connection health monitoring with success rate tracking
🎯 Smart Routing Rules
Route emails to different providers based on conditions:
Recipient email address or domain
Email subject containing specific keywords
The WordPress plugin that triggered the email
Example: WooCommerce orders → SendGrid, contact forms → Mailgun
Priority ordering with drag-free interface
⚡ Email Queue (Async Sending)
Queue emails for background delivery via WP-Cron
Pages load faster — no waiting for SMTP connections during page loads
Failed emails automatically retried with exponential backoff
Configurable batch size and retry limits
Real-time queue dashboard with cancel/retry controls
🔔 Failure Notifications
Get alerted instantly when emails fail to send
4 notification channels: Email, Slack, Discord, Telegram
Per-event subscription — choose exactly which events trigger alerts
Notification history with delivery status tracking
🔐 Security
AES-256-CBC encryption for all stored credentials (passwords, API keys, OAuth tokens)
Security Score Dashboard — real-time security posture with actionable fix recommendations
Dedicated encryption key support via wp-config.php
Rate limiting on all REST API endpoints
Six custom WordPress capabilities for role-based access control
Full audit log tracking every configuration change
CSRF protection, nonce verification, input sanitization throughout
🧙 Setup Wizard
Guided 7-step wizard for first-time configuration
Automatic import from WP Mail SMTP, Post SMTP, Fluent SMTP, and Easy WP SMTP
Provider presets with pre-filled configuration fields
Built-in connection test with real-time feedback
🛠️ Import / Export & Tools
Export your complete configuration as a JSON file (settings, connections, routing rules)
Import on another site to replicate your setup instantly
Debug Info page with system diagnostics for troubleshooting
Multisite-compatible import/export
🖥️ Modern Admin Interface
React-powered single-page application — fast and responsive
Real-time dashboard with delivery charts and statistics
Responsive design for desktop, tablet, and mobile
Built with WordPress accessibility standards (WCAG 2.1)
Full internationalization support (i18n-ready)
🌐 Multisite Ready
Full WordPress Multisite support out of the box
Network-wide or per-site configuration
Network admin management panel
Settings propagation across all network sites
For Developers
Hooks & Filters — 30+ action and filter hooks for complete customization
IoC Container — Laravel-inspired dependency injection container
PSR-4 Autoloading — Clean, namespaced codebase via Composer
REST API — Full REST API for headless or programmatic management
Extensible Providers — Add custom mail providers by implementing MailProviderInterface
Strategy Pattern — Clean architecture with strategy, repository, and service provider patterns
External services
This plugin connects to third-party email delivery services and notification platforms to send emails and alerts on your behalf. No data is sent to any service unless you explicitly configure and enable that provider or notification channel in the plugin settings.
Gmail API (Google)
When configured as a mail provider, this plugin connects to the Gmail API to send emails using your Google account via OAuth 2.0.
Endpoints: https://gmail.googleapis.com, https://accounts.google.com, https://oauth2.googleapis.com
Data sent: email content (recipients, subject, body, headers, attachments), OAuth tokens for authentication
When: each time WordPress sends an email through this provider, and during OAuth authentication
Google Privacy Policy
Google Terms of Service
Microsoft 365 / Outlook (Microsoft Graph API)
When configured as a mail provider, this plugin connects to the Microsoft Graph API to send emails using your Microsoft 365 or Outlook account via OAuth 2.0.
Endpoints: https://graph.microsoft.com, https://login.microsoftonline.com
Data sent: email content (recipients, subject, body, headers, attachments), OAuth tokens for authentication
When: each time WordPress sends an email through this provider, and during OAuth authentication
Microsoft Privacy Statement
Microsoft Services Agreement
SendGrid (Twilio)
When configured as a mail provider, this plugin sends emails through the SendGrid API.
Endpoint: https://api.sendgrid.com/v3
Data sent: email content (recipients, subject, body, headers, attachments), API key for authentication
When: each time WordPress sends an email through this provider
Twilio Privacy Policy
Twilio Terms of Service
Mailgun (Sinch)
When configured as a mail provider, this plugin sends emails through the Mailgun API.
Endpoints: https://api.mailgun.net/v3 (US region) or https://api.eu.mailgun.net/v3 (EU region)
Data sent: email content (recipients, subject, body, headers, attachments), API key for authentication
When: each time WordPress sends an email through this provider
Mailgun Privacy Policy
Mailgun Terms of Service
Brevo (formerly Sendinblue)
When configured as a mail provider, this plugin sends emails through the Brevo API.
Endpoint: https://api.brevo.com/v3
Data sent: email content (recipients, subject, body, headers, attachments), API key for authentication
When: each time WordPress sends an email through this provider
Brevo Privacy Policy
Brevo Terms of Use
SparkPost (MessageBird)
When configured as a mail provider, this plugin sends emails through the SparkPost API.
Endpoints: https://api.sparkpost.com/api/v1 (US) or https://api.eu.sparkpost.com/api/v1 (EU)
Data sent: email content (recipients, subject, body, headers, attachments), API key for authentication
When: each time WordPress sends an email through this provider
SparkPost Privacy Policy
SparkPost Terms of Use
Postmark (ActiveCampaign)
When configured as a mail provider, this plugin sends emails through the Postmark API.
Endpoint: https://api.postmarkapp.com
Data sent: email content (recipients, subject, body, headers, attachments), server API token for authentication
When: each time WordPress sends an email through this provider
Postmark Privacy Policy
Postmark Terms of Service
Amazon SES (Amazon Web Services)
When configured as a mail provider, this plugin sends emails through the Amazon SES v2 API using AWS Signature v4 authentication.
Endpoint: https://email.{region}.amazonaws.com (region depends on your configuration)
Data sent: email content (recipients, subject, body, headers, attachments), signed with AWS access key credentials
When: each time WordPress sends an email through this provider
AWS Privacy Notice
AWS Service Terms
Telegram Bot API
When configured as a notification channel, this plugin sends failure alerts to a Telegram chat using the Telegram Bot API.
Endpoint: https://api.telegram.org/bot{token}/sendMessage
Data sent: notification messages containing email failure details (recipient, subject, error message, timestamp)
When: each time a configured notification event occurs (e.g., email delivery failure)
Telegram Privacy Policy
Telegram Terms of Service
Slack
When configured as a notification channel, this plugin sends failure alerts to a Slack channel using incoming webhooks.
Endpoint: user-configured Slack webhook URL (https://hooks.slack.com/services/...)
Data sent: notification messages containing email failure details (recipient, subject, error message, timestamp)
When: each time a configured notification event occurs (e.g., email delivery failure)
Slack Privacy Policy
Slack Terms of Service
Discord
When configured as a notification channel, this plugin sends failure alerts to a Discord channel using webhooks.
Endpoint: user-configured Discord webhook URL (https://discord.com/api/webhooks/...)
Data sent: notification messages containing email failure details (recipient, subject, error message, timestamp)
When: each time a configured notification event occurs (e.g., email delivery failure)
Discord Privacy Policy
Discord Terms of Service
