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Post SMTP v4.0.1 - WordPress SMTP Plugin With OAuth & Mobile Alerts

Developer: WP ExpertsCategory: WordPress PluginsTrusted with 2 downloadsGeekLatest v4.0.1Updated 3w ago

Are you facing the WordPress not sending emails issue❓Don’t worry!

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Install + auto-update on your sitesIncluded in 12-month and Geek Lifetime plans (plus legacy 6-month) - install from wp-admin, up to 25 connected sites.

Requires Freemius Activator v2.13.0.1 to function. Install it first.

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Are you facing the WordPress not sending emails issue❓Don’t worry! Install the Post SMTP Plugin aka (WordPress mail SMTP plugin), for smooth WordPress email deliverability.

Over 400,000 website owners use Post SMTP daily to send WordPress emails securely and reliably💯 using Gmail SMTP, Microsoft Office 365/Outlook, and other SMTP integrations.

Post SMTP is a free, next-generation WordPress SMTP plugin that improves email deliverability for your WordPress site.

The best part is that to ensure high email deliverability the Post SMTP plugin offers 15+ SMTP mailer options, including Gmail, Brevo, Microsoft 365 SMTP (formerly Office 365), Amazon SES, Zoho Mail, Postmark, Mailgun, SendGrid, etc.

With the ✨Post SMTP Pro version✨, you can unlock even more advanced features, such as detailed email logs, email delivery stats and reporting, email open-tracking, premium SMTP integration (Microsoft 365, Amazon SES, and Zoho Mail SMTP), multiple options for email alerts (i.e., Teams, Webhook, Twilio, and Slack), and much more.

What is SMTP, and Why Do You Need It?
SMTP, short for Simple Mail Transfer Protocol, is the most widely used protocol for online email transmission. SMTP configuration with proper authentication for your WordPress site ensures that your WordPress emails do not end up in spam.

By default, WordPress sends emails using the PHP mail function, which isn’t ideal because most WordPress hosting servers don’t support PHP email.

On top of that, most email clients, such as Outlook (Office 365 / Microsoft365), Yahoo, Gmail, Brevo, Zoho, Amazon SES, Mailgun, etc., automatically block or mark spam emails that lack proper authentication.

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That’s why you need to install the Post SMTP plugin on your WordPress site to configure the SMTP mailer of your choice with one-click SMTP setup for Gmail, Microsoft 365, and more.

How Does Post SMTP Work?
Post SMTP allows you to easily replace the default PHP mail function (wp_mail) of your WordPress site with the SMTP mailer of your choice, like Microsoft 365(Office 365), Brevo, Zoho, SendGrid, Mailgun SMTP, Gmail (Gmail SMTP Server), Post Mark, Amazon SES etc., which in turn improves WordPress email deliverability.

This WordPress mail SMTP plugin provides detailed email logs, email open tracking, email alerts, and a mobile app to monitor WordPress email deliverability.

Additionally, with a 3-step setup wizard you can configure any SMTP mailer (e.g., Gmail SMTP (Gmail one-click setup), Microsoft Office 365, Mailgun, Brevo, etc.) securely via API Keys in seconds without providing your SMTP account credentials.

NOTE: If you want to set up a Gmail SMTP server for WordPress, check out our detailed guide on how to configure Gmail SMTP server to send WordPress emails reliably.

Ultimately, this WordPress SMTP plugin helps you fix all your issues related to WordPress not sending emails.

⚡ Features That Make Post SMTP Stand Out
✅ Quick Setup Wizard: Easy-to-use and powerful 3-Step Setup Wizard for quick WordPress SMTP configuration with One-click SMTP setup for Gmail SMTP and Microsoft 365 SMTP.

✅ SPF, DKIM & DMARC Checks: Keep an eye on domain’s reputation with out built-in Spam Score Checker that looks at your DNS records..

✅ Detailed Email Logs: Quickly view, filter, and check the status of all your WordPress emails and error messages with a simple click, ensuring your email logs are always up to date.

✅ Post SMTP Mobile App: Get WordPress email alerts directly on your mobile phone so you can track email deliverability on the go.

✅ Extensive Email Reporting: Get a thorough report at a glance regarding your WordPress email deliverability performance, including email open tracking and other important stats.

✅ Resend Email Attachments [PRO]: With a single click, you can resend any email attachment right through your email log screen, maintaining a seamless record in your email logs.

✅ OAuth 2.0 Support: Authenticate all major SMTP service providers’ accounts (i.e., Microsoft Office 365/Microsoft365, Brevo, Gmail SMTP (Gmail one-click setup), Amazon SES, SendGrid, Mailgun, etc.) securely using APIs.

✅ Fallback Mailing: Easily set up a backup WordPress SMTP mailer to send any transactional email in case of a failure with the main mailer.

✅ Instant Failure Notification: In case of any WordPress email delivery failure, you’ll get an instant email alert, Slack notification, SMS (via Twilio), push notification (via webhook and Chrome Extension), etc.

✅ Free Chrome Extension:Receive all your WordPress email alerts for failed email deliveries directly into your Chrome browser window.

✅ Weekly Email Summary: Get a snapshot of your WordPress email deliverability report right in your inbox every week, which reveals the total number of emails, the number of failed emails, total successful email deliveries, and your recent email logs.

✅ Unparalleled Customer Support: We offer multiple support options, including email, a WordPress forum, and even one-on-one expert assistance for WordPress SMTP Configuration and all your email delivery issues.

⚡ Post SMTP Mobile App: Get an Instant Pulse of Your WordPress Emails
✅ Keep track of Your Emails: You can monitor all the emails sent from your WordPress site and check the status of each email.

✅ Get Instant Alerts: When an email fails to deliver, you will receive an instant notification on your phone.

✅ Resend Failed Emails [PRO]: With one tap on your app, you can resend any failed email.
Preview Any Email: You can preview your emails and see how it looks.

✅ Connect Multiple Sites [PRO]: Monitor email logs and get email failure notifications (email alerts) for all your WordPress sites right from the app.

✅ Troubleshoot Errors: Quickly fix email failure issues by viewing the error details with a single tap.

Recent releases

Release history

View all 5 versions
v4.0.1LatestVerified Safe
Aug 24, 202620.1 MB
* Rolled back from 4.0.0-beta.1
Jun 24, 202620.1 MB
View changelog
Improved
  • – Updated dashboard banners and removed the Extensions screen from the plugin menu.
Apr 28, 202620.1 MB
View changelog
Improved
  • – Updated Emailit API to v2.
Fixed
  • – Added Header support in Maileroo.
  • – Resolved qrstr class conflict.
  • – Emailit API status handling (status code 201 was incorrectly marked as failed instead of pending/successful).
  • – Resolved fatal error: Class "HTMLPurifier_Config" not found.
  • – Fixed SMTP2GO false positive response.

Frequently asked questions

Is Post SMTP (Activated) GPL licensed?
Yes, Post SMTP (Activated) is distributed under the GNU General Public License (GPL). You can legally use, modify, and redistribute it on unlimited websites.
What is the latest version of Post SMTP (Activated)?
The latest version of Post SMTP (Activated) on GPLCoffee is v4.0.1 (released Aug 24, 2026, 20.1 MB download size). Every new release is synced automatically, and subscribers can update directly from their WordPress dashboard with the one-click connector plugin.
How much does Post SMTP (Activated) cost on GPLCoffee?
Post SMTP (Activated) is available for $8.99 for a 1-year license or $22.99 for a lifetime license. Membership plans also include credit-based access so you can download Post SMTP (Activated) along with thousands of other plugins, themes, and PHP scripts for a single subscription.
Which WordPress and PHP versions does Post SMTP (Activated) support?
The current release of Post SMTP (Activated) requires WordPress 5.6.0 or higher, tested up to WordPress 7.0, PHP 7.1 or higher. Per-release compatibility details are listed in the version history.
Is Post SMTP (Activated) safe to download?
Yes. The latest release of Post SMTP (Activated) (v4.0.1) was scanned with VirusTotal and came back clean. Scan results are visible on each version page, and releases flagged as malicious are blocked from the catalog.

Auto-updates included

Install it once, update automatically.

The GPLC Connector installs this plugin from your wp-admin and rolls out new versions to your connected sites - up to 25. Included with 12-month and Geek Lifetime plans (plus legacy 6-month).