Yes, AcyMailing is free to use. It is available as a free plugin on WordPress.org.

How many websites use AcyMailing?

AcyMailing has 30 active installations as tracked by WordPress.org.

What are the best AcyMailing alternatives?

Popular alternatives to AcyMailing include Headers Security Advanced & HSTS WP, WP Hide & Security Enhancer, Unique Headers. You can compare them side-by-side on our comparison pages.

Does AcyMailing work with the latest WordPress?

AcyMailing has been tested up to WordPress 6.9.4. It requires WordPress false+ and PHP false+.

AcyMailing – Custom headers in emails — Reviews, Rating & Alternatives (2026)

Name: AcyMailing – Custom headers in emails
Author: AcyMailing Newsletter Team

As of April 2026, AcyMailing is a WordPress headers plugin with 30 active installations and a 0/5 rating0. It has been downloaded 6.6K+ times in total. Requires WordPress false+ and PHP false+. Available on WordPress.org since 2021. Recently updated within the last 3 months. Top alternative: Headers Security Advanced & HSTS WP.