Post SMTP Pro

Note: Install the core (activated) version from here.

By default, WordPress sends emails using the built‑in PHP mail function (wp_mail()), which can be unreliable because many hosts or mail providers flag such emails as suspicious or spam. Post SMTP replaces this mechanism with a full SMTP interface—authenticating with real mail servers and providing detailed feedback so you can monitor email deliverability, troubleshoot issues, and ensure critical notifications reach their recipients.

Key Features

• Setup Wizard: Guides you through configuring your “From” email, selecting an SMTP provider, authenticating via API/OAuth, and running a test email.
• Secure Authentication: Supports OAuth 2.0 (avoiding plain passwords) and other secure protocols to connect with major providers.
• Detailed Email Logs: Records every email sent: sender, recipient, subject, status, error message if any—so you can audit and review delivery.
• Fallback SMTP Mailer: Allows you to set a secondary mailer to automatically take over if the primary one fails—reducing missed emails.
• Error Alerts & Notifications: Alerts you when email delivery fails; you can review the errors and take corrective action promptly.
• Performance‑Friendly Design: Operates asynchronously in the background, minimizing impact on page speed and site performance.

Typical Use Cases

• An online store sending order confirmations, shipping updates and customer notifications and needing higher deliverability.
• A membership site where password resets, account notifications and new‑registration emails must reach users reliably.
• A blog or business website with contact forms whose messages must arrive in inboxes, not spam folders.
• A WordPress multisite network where a single, robust SMTP setup applies across many subsites for consistency and control.

Setup & Workflow

1. Install and activate the Post SMTP plugin in your WordPress site.
2. Run the setup wizard: enter sender email and name, choose your SMTP provider, authenticate (API or credentials).
3. Send a test email to verify that configuration works and email appears in inbox (not spam).
4. Optionally configure fallback mailer settings so a backup account handles emails if the primary fails.
5. Monitor the email log regularly: check for any failed deliveries, resend if required, and keep SMTP credentials current.
6. Maintain the plugin by keeping it updated, reviewing error alerts, and adjusting settings as your email provider or domain configuration evolves.

Benefits

• Ensures that your site’s emails have a much higher chance of reaching inboxes rather than getting blocked or marked as spam.
• Gives you full visibility and control over outgoing email traffic, including errors, logs and retries.
• Reduces the risk of lost or undelivered transactional messages—important for redeeming trust and functionality (orders, memberships, forms).
• Provides scalable infrastructure for sites with high volume of emails, multiple forms, user notifications or large eCommerce catalogs.
• Helps with compliance and deliverability by using authenticated SMTP rather than generic PHP‑mail, improving domain reputation and email sender trust.