Lettr – Email API

How well this listing is tuned to rank in WordPress.org search, on the factors an owner controls. Not popularity, optimization.

Directory rank vs rivals

wp.org popularity rank over time · higher is better · when a rival's line climbs above yours, they've overtaken you

Modeled within the band wp.org reports; tightens as we track daily.

Growth timeline

Install-tier crossings we have observed, and how long each tier took to outgrow

No tier crossings observed yet.

Competes with

The plugins that solve the same job, ranked by shared tags then reach — closest match first

• Email Deliverability – SMTP Replacement, Email API Deliverability & Email Log 200K+ installs · 3.0★ · 3 shared tags B
• WP Mail SMTP by WPForms – The Most Popular SMTP and Email Log Plugin 4M+ installs · 4.8★ · 2 shared tags A
• Easy WP SMTP – WordPress SMTP and Email Logs: Gmail SMTP, Office 365, Outlook, Custom SMTP, and more 500K+ installs · 4.6★ · 2 shared tags A
• Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App 300K+ installs · 4.7★ · 2 shared tags A
• WP Mail Logging 300K+ installs · 4.7★ · 2 shared tags A
• SureMail – SMTP and Email Logs Plugin with Amazon SES, Postmark, and Other Providers 200K+ installs · 4.5★ · 2 shared tags A

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Lettr – Email API: — active installs, 0.0★ (0 reviews). Plugin Pulse (WP Mayor), as of 2026-07-17. https://plugins.wpmayor.com/plugin/lettr