Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
Plugin Review
AI-ResearchedWhat is Post SMTP?
Post SMTP is a dedicated email deliverability plugin that replaces WordPress’s default PHP mail function with a configured SMTP mailer. Developed by Saad Iqbal, the plugin has been available for 9 years and currently holds over 300,000 active installs. It maintains a 4.7 out of 5 star rating from 523 reviews, with 91% of those being five-star ratings. The plugin directly addresses the common "WordPress not sending emails" issue by routing messages through authenticated SMTP services like Gmail, Microsoft 365, and Brevo.
The plugin’s core purpose is to prevent transactional emails from landing in spam folders. It supports 15+ SMTP mailer options out of the box. Post SMTP also includes a mobile application for monitoring email delivery on the go. The current version, 3.9.4, was last updated on June 3, 2026.
Key Features of Post SMTP
- OAuth 2.0 Authentication: Uses token-based access for Gmail, Office 365, and Yahoo, so your site never stores your email password.
- 15+ SMTP Mailer Options: Integrates with Gmail, Microsoft 365, Amazon SES, Postmark, Mailgun, SendGrid, Zoho Mail, and Brevo.
- Detailed Email Logs: Records every outgoing email, including delivery status, timestamp, and error messages for troubleshooting.
- Email Open Tracking: Monitors whether recipients open your emails, available in the Pro version.
- Multi-Channel Alerts: Sends notifications via Slack, Twilio, Microsoft Teams, or Webhook when emails fail to deliver.
- 3-Step Setup Wizard: Guides users through configuring any SMTP mailer using API keys in seconds, without manual server details.
- Backup SMTP: Automatically switches to a secondary mailer if the primary SMTP fails, ensuring continuous delivery.
- Mobile Application: Provides live email delivery stats and alerts directly from a smartphone.
Who Should Use Post SMTP?
Post SMTP is designed for site owners who rely on WordPress to send critical emails. This includes ecommerce stores sending order confirmations, membership sites delivering password resets, and contact form submissions. The plugin suits both beginners and experienced developers. Beginners benefit from the one-click setup for Gmail and Microsoft 365, while advanced users can configure custom SMTP settings. The plugin requires PHP 7.0+ and WordPress 5.6.0+, making it compatible with the vast majority of hosting environments.
With 300,000+ active installs and a 91% five-star rating, the plugin appeals to anyone who has experienced email delivery failures. It is especially useful for sites that previously relied on the PHP mail function, which most hosting servers do not support properly. The backup SMTP feature makes it a practical choice for high-traffic sites where email reliability directly impacts revenue.
Installation & Setup
Install the plugin from the WordPress repository and activate it to launch the 3-step setup wizard. The wizard asks you to choose a mailer, enter API credentials, and test the connection. No manual SMTP server details are required for most providers. The entire process takes under two minutes for supported services like Gmail and Microsoft 365.
Support & Community
The plugin’s support forum shows a 83% resolution rate over the last two months, with 19 of 20 open threads resolved. This high ratio indicates responsive developer engagement. The 6% one-star rating suggests some users encounter configuration issues, likely related to server-level restrictions or incorrect API permissions. The developer provides a detailed guide for Gmail SMTP setup and maintains a live demo for the Pro version. With a 9-year track record and consistent updates, the plugin offers reliable long-term support for email deliverability needs.
Pros & Cons
- With over 300,000 active installs and a 4.7/5 rating from 523 reviews, Post SMTP is a widely trusted and highly rated solution for WordPress email deliverability.
- It offers 15+ SMTP mailer options, including Gmail, Microsoft 365, Amazon SES, and Mailgun, giving users broad flexibility to choose their preferred email service.
- The plugin provides a mobile application for monitoring email logs and delivery stats, a feature not commonly found in competing SMTP plugins.
- Its support team resolves 95% of support threads (19 out of 20), indicating reliable and responsive assistance for users.
- The free version includes email logging and alerts, allowing users to track sent emails and receive notifications on failures without upgrading to the paid tier.
- Advanced features like email open-tracking, detailed delivery stats, and premium SMTP integrations (e.g., Microsoft 365, Amazon SES) require the paid Pro version, limiting functionality for free users.
- The plugin’s interface can feel cluttered with promotional banners for the Pro version, which may distract from core configuration tasks.
- Some users report that initial setup for non-standard SMTP providers (e.g., custom ports or authentication methods) is not as intuitive as one-click options for Gmail or Office 365.
Technical Details
- Requires WordPress
- 5.6.0+
- Requires PHP
- 7.0+
- Tested up to WP
- 7.0
- First Released
- 2017 (9+ years)
- Support (last 2 months)
- 18 threads — 83% resolved
Feature Tags
Frequently Asked Questions
Yes, Post SMTP is free and available on WordPress.org. With over 300K active installs and a 4.7/5 rating from 523 ratings, it offers robust email deliverability without any upfront cost.
Over 300,000 WordPress sites actively use Post SMTP daily. The plugin has been trusted by site owners since its first release in 2017.
Post SMTP requires WordPress version 5.6.0 or higher. This ensures compatibility with modern WordPress features and security updates.
Yes, the plugin was last updated on June 3, 2026, and has been actively maintained since its 2017 release. version 3.9.5 is the current stable release.
Post SMTP requires PHP version 7.0 or higher. Most hosting providers support this version, making it accessible for the majority of WordPress users.
Support is excellent, with 15 of 18 support threads resolved in the last 2 months, giving a 83% resolution rate. The plugin is authored by Saad Iqbal and backed by an active community.
Yes, it is designed for beginners with a straightforward setup for popular SMTP services like Gmail and Outlook. The plugin also supports OAuth 2.0, so you never need to share your password, making it both beginner-friendly and secure.
Key features include 15+ SMTP mailer options (Gmail, Microsoft 365, Amazon SES, and more), OAuth 2.0 authentication, and detailed email logs in the Pro version. The free version ensures reliable email delivery, while Pro adds alerts, backup SMTP, and a mobile app.