Post SMTP Pro WordPress Plugin

Post SMTP Pro (formerly Postman SMTP) is a comprehensive email delivery, logging, and diagnostic engine engineered to eliminate undelivered WordPress transactional emails. By replacing default PHP mail() functions with secure SMTP or direct API authentications (including Gmail, Microsoft 365, SendGrid, Mailgun, and Brevo), it prevents emails—such as order confirmations, password resets, and contact form entries—from landing in spam or being rejected by server firewalls. Equipped with OAuth 2.0 support, an email log dashboard with resend capabilities, automated fallback mailers, and instant push/email notifications upon delivery failure, Post SMTP Pro ensures your critical communications reach inbox destinations reliably.

Main Features

• OAuth 2.0 secure authentication — Connect seamlessly to Gmail, Google Workspace, and Microsoft 365 without saving plain-text email passwords in the WordPress database.
• API mailer integrations — Direct API connectivity for leading transactional email services, including SendGrid, Mailgun, Brevo (Sendinblue), Postmark, Amazon SES, and SparkPost.
• Comprehensive email logging — Inspect full headers, body content, delivery status, and transcript logs for every outgoing message directly from the dashboard.
• Automated fallback mailer — Configure a secondary backup SMTP or API service to automatically handle email dispatch if the primary server encounters an outage.
• Instant failure notifications — Receive real-time failure alerts via Slack, Twilio SMS, Pushover, Webhooks, or secondary email addresses whenever an email fails to send.
• One-click email resend — Resend failed or pending emails individually or in bulk directly from the diagnostic logging interface.
• Built-in connectivity tester — Diagnose server firewall blocks, port restrictions, and SPF/DKIM misconfigurations prior to sending live messages.
• Multisite network compatibility — Configure global email settings network-wide or manage individual SMTP configurations for sub-sites on WordPress Multisite networks.

Benefits

• Maximizes inbox deliverability — Bypasses weak server PHP mail() execution to prevent transactional emails from being flagged as spam.
• Enhanced authentication security — OAuth 2.0 integration eliminates password exposure risks and meets strict security compliance standards.
• Zero missed notifications — Automatic fallback mailers and instant alerts ensure critical sales, registration, and contact inquiries are never lost.
• Fast troubleshooting — Detailed SMTP conversation transcripts allow site administrators to identify and resolve delivery issues in seconds.
• Seamless API speed — Direct HTTPS API connections deliver outgoing emails faster than traditional SMTP socket connections.

Who is it suitable for?

• WooCommerce store owners needing 100% reliable delivery for purchase receipts, order updates, and customer notifications.
• Membership & community websites relying heavily on automated account activation, password resets, and user alerts.
• Web development agencies & freelancers configuring secure email infrastructure across client portfolios.
• Enterprise & high-volume publishers requiring redundant fallback mailers and comprehensive delivery tracking logs.
• WordPress administrators replacing basic SMTP plugins with secure, OAuth 2.0-compliant email delivery frameworks.