Frumbik SMTP for WordPress Plugin Directory

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