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Best email API plugins for WordPress

The most popular email API plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Email Deliverability leads with 200K+ active installs, ahead of SwiftTrap for Mailtrap (10+) and Lettr (fewer than 10). All 4 plugins tagged “Email API” are below, with figures from WordPress.org that update every day.

Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.

Research this niche or see all plugins.

Top 4 email API plugins

  1. 1.
    Email Deliverability

    The most installed email API plugin, with 200K+ active installs. Rated 2.5 from 17 reviews, updated 3 months ago.

  2. 2.
    SwiftTrap for Mailtrap

    10+ active installs. No reviews yet, updated 1 month ago.

  3. 3.
    Lettr

    Fewer than 10 active installs. No reviews yet, updated 1 month ago.

  4. 4.
    Volanea Email Delivery

    Fewer than 10 active installs. No reviews yet, updated 2 months ago.

All 4 plugins tagged “Email API”