Yes, Dead-Letter is free to use. It is available as a free plugin on WordPress.org.

How many websites use Dead-Letter?

Dead-Letter has 0 active installations as tracked by WordPress.org.

What are the best Dead-Letter alternatives?

Popular alternatives to Dead-Letter include WP Mail SMTP by WPForms – The Most…, MC4WP: Mailchimp for WordPress, Easy WP SMTP – WordPress SMTP and Email…. You can compare them side-by-side on our comparison pages.

Does Dead-Letter work with the latest WordPress?

Dead-Letter has been tested up to WordPress 5.3.21. It requires WordPress 2.9+ and PHP 5.4+.

Dead-Letter — Reviews, Rating & Alternatives (2026)

Name: Dead-Letter
Author: SoftCreatR

As of April 2026, Dead-Letter is a WordPress email plugin with 0 active installations and a 0/5 rating0. It has been downloaded 1.3K+ times in total. Requires WordPress 2.9+ and PHP 5.4+. Available on WordPress.org since 2019. Last updated 6 years ago — may have compatibility concerns. Top alternative: WP Mail SMTP by WPForms – The Most….

0/5Rating

0active installs

1.3K+total downloads

7 yearssince 2019

Overview

This wordpress plugin utilizes our daily dump of disposable email address domains to detect the use of disposable email addresses.

It uses the WordPress internal is_email hook, therefore it integrates seamlessly into 3rd party plugins like WooCommerce, Gravity Forms, Jetpack and every other plugin that uses the is_email() function.

This plugin follows the “Privacy by design” principles by not sharing any personal informations of your users with 3rd parties. By installing/activating this plugin, you agree, that you’ve read and understood our privacy policy.

Read full description on WordPress.org