Super Duper Plugins

Super Duper SMTP Mail Bridge replaces the unreliable WordPress PHP mail function with a properly authenticated SMTP connection. Emails reach inboxes instead of spam folders or the void.
🇨🇭🇩🇪🇦🇹 Hinweis für DACH-Nutzer: Plugin und Support sind auf Deutsch (Schweiz/Deutschland/Österreich) verfügbar. Alle Texte und Einstellungen sind vollständig auf Deutsch übersetzt.
Unlike other SMTP plugins, this one gives you everything for free – no feature gates, no “upgrade to Pro” nags, no premium tiers. Every feature listed below works right out of the box.
<h4>Why choose this plugin over the big names?</h4>
Most popular SMTP plugins either lock essential features behind a paywall or are bloated with dozens of API integrations you don’t need. Here’s what makes Super Duper SMTP Mail Bridge different:
🛡️ Backup SMTP with Automatic Failover — WP Mail SMTP charges $49+/year for this. FluentSMTP and Post SMTP offer fallback, but our implementation automatically logs each failover event separately so you can see exactly when and why your primary server failed.
⏱️ Built-in Rate Limiting — No other free SMTP plugin offers this. Protect your domain reputation when a contact form gets spammed or a plugin goes rogue. Set limits per minute, hour, or day. Blocked emails are logged with a clear “Blocked” status.
🌐 Domain Control (Whitelist & Blacklist) — Block disposable email domains (tempmail.com, guerrillamail.com) or restrict sending to specific recipient domains only. No other free SMTP plugin has both whitelist AND blacklist for recipient domains.
🔐 AES-256-CBC Password Encryption — Your SMTP password is encrypted before it’s stored in the database. Most free SMTP plugins store credentials in plain text or use simple base64 encoding.
📋 Full Email Log with HTML Preview — View the actual rendered email in an iframe preview or switch to source code view. Filter by status (Success, Failed, Blocked, Failover). WP Mail SMTP charges for email logging. We include it free, with content.
🔧 SMTP Debug Transcript — Enable debug mode and get the complete SMTP server conversation logged for each email. Essential for troubleshooting – most plugins don’t offer this at all, or charge for it.
⚠️ Smart Admin Notifications — Get notified by email when failures exceed your threshold. Includes the last error details, recipient, and subject. Built-in loop prevention ensures the notification itself doesn’t trigger more notifications.
👁️ BCC Monitoring & GDPR/DSGVO Compliance — Automatically BCC all outgoing emails to one or more monitoring addresses. Combined with the email log, this provides legally verifiable proof that an email was actually sent – essential for GDPR (DSGVO) compliance. If a data subject ever disputes whether they received a notification, password reset, or consent confirmation, you have both the log entry and an independent BCC copy as evidence. No other free SMTP plugin offers this level of compliance-ready email auditing.
🚫 Zero Bloat — No setup wizards, no upsell banners, no affiliate links to email services, no tracking. Just a clean settings page, your SMTP config, and a log. Under 50 KB total plugin size.
<h4>Complete Feature List</h4>
<ul>
<li>SMTP configuration (host, port, TLS/SSL, authentication)</li>
<li>Configurable connection timeout (5–120 seconds)</li>
<li>Custom sender name and email address</li>
<li>Allowed sender domain validation</li>
<li>Backup SMTP server with automatic failover</li>
<li>Rate limiting (per minute, hour, or day)</li>
<li>BCC monitoring to one or more addresses</li>
<li>Recipient domain whitelist (only send to these)</li>
<li>Recipient domain blacklist (never send to these)</li>
<li>Admin error notification with configurable threshold</li>
<li>AES-256-CBC password encryption</li>
<li>Complete email log with status, headers, and error messages</li>
<li>HTML email preview (rendered) and source code view</li>
<li>SMTP debug transcript logging</li>
<li>Test email function directly from admin</li>
<li>Automatic log cleanup after configurable number of days</li>
<li>Clean uninstall – removes all data</li>
<li>Translations: German (CH/DE/AT), English, French, Spanish, Italian, Dutch</li>
</ul>
<h4>Feature Comparison</h4>
Here is how Super Duper SMTP Mail Bridge compares to the most popular SMTP plugins, feature by feature.
Legend: ✅ = included for free · 🔒 = paid / Pro only · ❌ = not available
Super Duper SMTP Mail Bridge (this plugin)
<ul>
<li>SMTP configuration: ✅</li>
<li>Email logging: ✅</li>
<li>Email content stored in log: ✅</li>
<li>Backup SMTP with automatic failover: ✅</li>
<li>Rate limiting (per minute / hour / day): ✅</li>
<li>Recipient domain whitelist: ✅</li>
<li>Recipient domain blacklist: ✅</li>
<li>BCC monitoring (GDPR/DSGVO proof): ✅</li>
<li>Strong password encryption (AES-256-CBC): ✅</li>
<li>SMTP debug transcript: ✅</li>
<li>Admin error alerts (failure threshold): ✅</li>
<li>Allowed sender domain validation: ✅</li>
<li>No ads / upsell in the admin: ✅</li>
</ul>
WP Mail SMTP
<ul>
<li>SMTP configuration: ✅</li>
<li>Email logging: 🔒</li>
<li>Email content stored in log: 🔒</li>
<li>Backup SMTP with automatic failover: 🔒</li>
<li>Rate limiting (per minute / hour / day): ❌</li>
<li>Recipient domain whitelist: ❌</li>
<li>Recipient domain blacklist: ❌</li>
<li>BCC monitoring (GDPR/DSGVO proof): ❌</li>
<li>Strong password encryption (AES-256-CBC): ❌</li>
<li>SMTP debug transcript: ❌</li>
<li>Admin error alerts (failure threshold): 🔒</li>
<li>Allowed sender domain validation: ❌</li>
<li>No ads / upsell in the admin: ❌</li>
</ul>
FluentSMTP
<ul>
<li>SMTP configuration: ✅</li>
<li>Email logging: ✅</li>
<li>Email content stored in log: ✅</li>
<li>Backup SMTP with automatic failover: ✅</li>
<li>Rate limiting (per minute / hour / day): ❌</li>
<li>Recipient domain whitelist: ❌</li>
<li>Recipient domain blacklist: ❌</li>
<li>BCC monitoring (GDPR/DSGVO proof): ❌</li>
<li>Strong password encryption (AES-256-CBC): ❌</li>
<li>SMTP debug transcript: ❌</li>
<li>Admin error alerts (failure threshold): ✅</li>
<li>Allowed sender domain validation: ❌</li>
<li>No ads / upsell in the admin: ✅</li>
</ul>
Post SMTP
<ul>
<li>SMTP configuration: ✅</li>
<li>Email logging: ✅</li>
<li>Email content stored in log: ✅</li>
<li>Backup SMTP with automatic failover: ✅</li>
<li>Rate limiting (per minute / hour / day): ❌</li>
<li>Recipient domain whitelist: ❌</li>
<li>Recipient domain blacklist: ❌</li>
<li>BCC monitoring (GDPR/DSGVO proof): ❌</li>
<li>Strong password encryption (AES-256-CBC): ❌</li>
<li>SMTP debug transcript: ✅</li>
<li>Admin error alerts (failure threshold): ✅</li>
<li>Allowed sender domain validation: ❌</li>
<li>No ads / upsell in the admin: ❌</li>
</ul>
YaySMTP
<ul>
<li>SMTP configuration: ✅</li>
<li>Email logging: ✅</li>
<li>Email content stored in log: ✅</li>
<li>Backup SMTP with automatic failover: ✅</li>
<li>Rate limiting (per minute / hour / day): ❌</li>
<li>Recipient domain whitelist: ❌</li>
<li>Recipient domain blacklist: ❌</li>
<li>BCC monitoring (GDPR/DSGVO proof): ❌</li>
<li>Strong password encryption (AES-256-CBC): ❌</li>
<li>SMTP debug transcript: ❌</li>
<li>Admin error alerts (failure threshold): ✅</li>
<li>Allowed sender domain validation: ❌</li>
<li>No ads / upsell in the admin: ❌</li>
</ul>
Every feature in Super Duper SMTP Mail Bridge is included for free — no premium tier, no feature gates.

Super Duper SMTP Mail Bridge

Reliable SMTP email delivery with backup failover, rate limiting, domain control, BCC monitoring, and full email log. 100% free.

WP Chill

Silkalns

Jack K

George Ciobanu

SolidWP

Razvan Aldea

Alex

Your WordPress website is sending emails out daily, but are your users and visitors receiving them? When it comes to ensuring email deliverability, lean on a proven equation: SMTP plugin + email service provider = success. Solid Mail is an easy-to-use, set-it-and-forget-it SMTP plugin that will help you stop worrying about email deliverability.
<h4>❓How does Solid Mail Help You Implement SMTP Email on your website?</h4>
Solid Mail makes connecting to many popular SMTP services straightforward and clear. Solid Mail currently supports the following Email Service Providers (ESPs):
<ul>
<li>Sendgrid</li>
<li>MailGun</li>
<li>Brevo (formally Sendinblue)</li>
<li>Amazon SES</li>
<li>Postmark</li>
<li>Manual connection (connect to any ESP)</li>
</ul>
Enjoy complete flexibility and reliability in email delivery. Set up multiple connections to send emails via different Email Service Providers according to the From: address, and choose a fallback connection to ensure messages are sent even if a connection fails or the address doesn’t match an existing connection.
<a href="https://solidwp.com/blog/alternatives-for-wordpress-transactional-emails/" rel="nofollow ugc">Learn more about transactional email services for your WordPress website here</a>.
<h4>🤔Why Should You Use an SMTP Plugin for Your WordPress Website Instead of the Native PHP Mail?</h4>
WordPress out the box uses PHP’s built-in mail function to send emails such as password reset requests, WooCommerce order invoices and more. The issue? PHP Mail is only as good as your server and most hosts don’t have dedicated PHP Mail monitoring.
Even hosts that specialize in hosting WordPress either don’t offer email services or don’t actively monitor for deliverability. That means you can be at the mercy of noisy neighbors sending spam to purchased email subscriber lists, or spammers running the latest scam. Either way it impacts the health of the server in the eyes of ESPs such as Google, Yahoo, Outlook, and others meaning that most of the time your emails don’t even hit the inbox!
Go from spam-box to inbox with Solid Mail: an SMTP (Simple Mail Transfer Protocol) plugin. Combine with an email service provider such as SendGrid, Brevo, Amazon SES, and others and see your emails start getting delivered.
An SMTP plugin – like Solid Mail – is essentially a higher-level and more advanced method of sending emails between servers that uses a username and password or other secure method to create the connection to an email service provider (ESP). ESPs (like those listed below) provide robust solutions to deliverability issues by running dedicated servers for sending that are managed ‘round the clock for issues like blacklisting, spam removal, and more. In addition they use authentication protocols like SSL/TLS to secure email transmissions and ensure better deliverability.
Using an SMTP plugin combined with an email service provider instead of PHP Mail on the server leads to more reliable, secure, and efficient email communication for WordPress websites. <a href="https://solidwp.com/blog/wordpress-not-sending-email/" rel="nofollow ugc">Find out more about SMTP and WordPress email deliverability here</a>.
<h4>📑How does Solid Mail Validate Email Deliverability with Email Logs?</h4>
Solid Mail gives you an easy-on-the-eyes interface to review and inspect your comprehensive email logs and understand if your email was sent or not. This transparency helps in debugging any email deliverability issues with your website.
Many email service providers offer advanced features like email tracking and analytics. Solid Mail’s email logs help optimize email strategies by making it easy for you to view and act on patterns and trends.
<h4>📧 Email Logging is a great way to help troubleshoot WordPress email deliverability issues</h4>
But how do you know and validate that your emails are actually being sent from your website correctly? The answer is email logs.
Email logs are crucial for validating that your emails are being delivered as intended, serving as an indispensable tool for troubleshooting and ensuring reliability in communication. These logs provide detailed records of every email transaction, including timestamps, recipient addresses, and errors in the SMTP authentication process.

Solid Mail – SMTP email and logging made by SolidWP

This plugin was responsible of the largest data breaching in Mossack Fonseca's wordpress website. wordfence states something like this. so please don't use this plugin if you care about the security of your website. 
MF are running the WP SMTP plugin which gives you the ability to send mail from your website via a mail server. This plugin stores email server address and login information in plain text in the WordPress database. The login information stored is a mail server SMTP login for sending email. Here is a screenshot showing the login information for this plugin appearing in a database as plain text on one of our test servers:



One of most dangerous plugins in the whole world for wordpress

As always it good

With the addition of a default Reply-To, it would be perfect for the websites I install SMTP plugins on.

Almost perfect


I'm satisfied with version 1.2.7.The newer updates add unnecessary features.With version 1.2.7, the emails are reliably delivered to the inbox and even marked as important.But with the latest versions, emails often go straight to the spam folder.


I'm satisfied with version 1.2.7

Email deliverability made SOLID. Connect to your chosen email provider with an intuitive set-it-and-forget-it SMTP plugin.

Super Duper SMTP Mail Bridge vs Solid Mail – SMTP email and logging made by SolidWP