Allow Multiple Accounts vs Frumbik SMTP

Allow multiple user accounts to be created, registered, and updated having the same email address. By default, WordPress only allows a specific email address to be used for a single user account. This plugin removes that restriction. The plugin’s settings page (accessed via Users -> Multiple Accounts or via the Settings link next to the plugin on the Manage Plugins page) provides the ability to allow only certain email addresses the ability to have multiple accounts (such as if you only want admins to have that ability; by default all email addresses can be used more than once). You may also specify a limit to the number of accounts an email address can have (by default there is no limit). The settings page also provides a table listing all user accounts that share email addresses (see screenshot). Compatible with Multisite and BuddyPress as well. Links: Plugin Homepage | Plugin Directory Page | Author Homepage Template Tags The plugin provides three optional template tags for use in your theme templates. Functions Returns a count of the number of users associated with the given email. Returns the users associated with the given email. Returns a boolean indicating if the given email is associated with more than one user account. Arguments $email (string) An email address. Filters The plugin exposes three filters for hooking. Typically, customizations utilizing these hooks would be put into your active theme’s functions.php file, or used by another plugin. c2c_count_multiple_accounts (filter) The ‘c2c_count_multiple_accounts’ hook allows you to use an alternative approach to safely invoke c2c_count_multiple_accounts() in such a way that if the plugin were deactivated or deleted, then your calls to the function won’t cause errors in your site. Arguments: same as for c2c_count_multiple_accounts() Example: Instead of: Do: c2c_get_users_by_email (filter) The ‘c2c_get_users_by_email’ hook allows you to use an alternative approach to safely invoke c2c_get_users_by_email() in such a way that if the plugin were deactivated or deleted, then your calls to the function won’t cause errors in your site. Arguments: same as for c2c_get_users_by_email() Example: Instead of: Do: c2c_has_multiple_accounts (filter) The ‘c2c_has_multiple_accounts’ hook allows you to use an alternative approach to safely invoke c2c_has_multiple_accounts() in such a way that if the plugin were deactivated or deleted, then your calls to the function won’t cause errors in your site. Arguments: same as for c2c_has_multiple_accounts() Example: Instead of: Do:

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