Choosing the right software
Treat transport configuration and deliverability as separate checks. Confirm the sending domain, authentication method and provider limits before connecting a mail plugin. Test form notifications, password resets and transaction emails, then inspect failures without storing sensitive message content unnecessarily. Sending credentials belong in protected configuration, and external sending-service charges should be evaluated separately from the plugin license.
This shortlist covers 5 currently listed WordPress options selected from 25 catalog records with supported evidence for this use case. Each included record has an official directory URL, a recent metadata check and a recorded upstream update within two years. The selection prioritizes a matching stated purpose, then reported adoption as a tie-breaker. It is not a hands-on performance ranking or a security endorsement. The snapshot was prepared on 2026-10-02.
1. WP Mail SMTP by WPForms. Source description: “Make email delivery easy for WordPress. Connect with SMTP, Gmail, Outlook, SendGrid, Mailgun, SES, Zoho, + more. Rated…”. Deployment: WordPress 5.5 / PHP 7.4. Listed version 4.10.0. 4,000,000 active installations reported by WordPress.org. The source identifies the developer as Syed Balkhi. Its directory metadata records testing through WordPress 7.1.2; this is an upstream compatibility declaration, not a BuyPHP test. Compare the listed 4.10.0 release with the version available when you install. The upstream update recorded for this candidate is 2026-09-30. Open its product record for the attributed facts and official download route before adding it to your implementation plan.
2. FluentSMTP. Source description: “Free WP Mail SMTP plugin. Fix WordPress email deliverability with Gmail, Amazon SES, SendGrid, Mailgun, Postmark, Cloudflare, Brevo…”. Deployment: WordPress 6.5 / PHP 7.4. Listed version 2.4.1. 700,000 active installations reported by WordPress.org. The source identifies the developer as WPManageNinja. Its directory metadata records testing through WordPress 7.1.2; this is an upstream compatibility declaration, not a BuyPHP test. Compare the listed 2.4.1 release with the version available when you install. The upstream update recorded for this candidate is 2026-09-27. Open its product record for the attributed facts and official download route before adding it to your implementation plan.
3. GoSMTP. Source description: “Send emails from your WordPress site using your preferred SMTP provider like Gmail, Outlook, AWS, Zoho, SMTP.com, Brevo…”. Deployment: WordPress 5.5 / PHP 5.5. Listed version 1.2.3. 500,000 active installations reported by WordPress.org. The source identifies the developer as Softaculous. Its directory metadata records testing through WordPress 7.1.2; this is an upstream compatibility declaration, not a BuyPHP test. Compare the listed 1.2.3 release with the version available when you install. The upstream update recorded for this candidate is 2026-09-23. Open its product record for the attributed facts and official download route before adding it to your implementation plan.
4. Easy WP SMTP. Source description: “Make SMTP email sending and delivery easy. Configure Gmail SMTP, Outlook, Brevo, SendGrid, Mailgun, SendLayer or connect to…”. Deployment: WordPress 5.5 / PHP 7.4. Listed version 2.15.1. 500,000 active installations reported by WordPress.org. The source identifies the developer as Syed Balkhi. Its directory metadata records testing through WordPress 7.1.2; this is an upstream compatibility declaration, not a BuyPHP test. Compare the listed 2.15.1 release with the version available when you install. The upstream update recorded for this candidate is 2026-08-12. Open its product record for the attributed facts and official download route before adding it to your implementation plan.
5. Post SMTP. Source description: “Install Post SMTP (WordPress SMTP Plugin) to fix WordPress email delivery. Connect Gmail SMTP, Microsoft 365, Brevo, SendGrid,…”. Deployment: WordPress 5.6.0 / PHP 7.1. Listed version 4.0.2. 300,000 active installations reported by WordPress.org. The source identifies the developer as Saad Iqbal. Its directory metadata records testing through WordPress 7.1.2; this is an upstream compatibility declaration, not a BuyPHP test. Compare the listed 4.0.2 release with the version available when you install. The upstream update recorded for this candidate is 2026-09-24. Open its product record for the attributed facts and official download route before adding it to your implementation plan.
Compatibility comparison: 4 distinct prerequisite statements are recorded across this shortlist. WordPress 5.5 / PHP 7.4; WordPress 6.5 / PHP 7.4; WordPress 5.5 / PHP 5.5; WordPress 5.6.0 / PHP 7.1. Match these minimum requirements to your actual PHP and WordPress versions, then test the specific workflow on a copy of your site. A minimum version is not a promise that every theme, extension or newer runtime combination works. Missing integration evidence should remain a question for the developer.
Before choosing, use the linked product records to check current prerequisites and source timestamps. Ask the developer about edition-specific capabilities, update support and any external service account needed. Source metadata helps create a practical shortlist, but deployment quality still depends on your configuration, content and integrations. No price or feature should be treated as verified unless its source is recorded.