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MC4WP: Mailchimp for WordPress vs Site Mailer – SMTP Replacement, Email… (2026)

Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.

MC4WP: Mailchimp for WordPress

MC4WP: Mailchimp for WordPress

4.8(1,492)

1.0M+ active installs

Free

Updated 1 week ago
View MC4WP: Mailchimp for WordPress
VS
Site Mailer – SMTP Replacement, Email…

Site Mailer – SMTP Replacement, Email…

2.2(14)

200K+ active installs

Free

Updated 1 month ago
View Site Mailer – SMTP Replacement, Email…

Quick Verdict

As of April 2026, MC4WP: Mailchimp for WordPress has a higher user rating (4.8/5 from 1,492 reviews) and leads in active installations (1.0M+ vs 200K+). Both are free WordPress plugins. MC4WP: Mailchimp for WordPress has accumulated 73M+ total downloads while Site Mailer – SMTP Replacement, Email… has 1.8M+. Site Mailer – SMTP Replacement, Email… has a higher support resolution rate (100% vs 89%).

Detailed Comparison

Rating
4.8/5MC4WP: Mailchimp for WordPress
◄
Site Mailer – SMTP Replacement, Email…2.2/5
Total Reviews
1,492MC4WP: Mailchimp for WordPress
◄
Site Mailer – SMTP Replacement, Email…14
Active Installs
1.0M+MC4WP: Mailchimp for WordPress
◄
Site Mailer – SMTP Replacement, Email…200K+
Total Downloads
73M+MC4WP: Mailchimp for WordPress
◄
Site Mailer – SMTP Replacement, Email…1.8M+
Support Resolution
89%MC4WP: Mailchimp for WordPress
►
Site Mailer – SMTP Replacement, Email…100%
Last Updated
1 week agoMC4WP: Mailchimp for WordPress
◄
Site Mailer – SMTP Replacement, Email…1 month ago
First Released
2013MC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…2024
Age
13 yearsMC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…2 years
WP Requires
4.6+MC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…6.6+
PHP Requires
7.4+MC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…7.4+
Business Model
FreeMC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…Free
Latest Version
4.12.1MC4WP: Mailchimp for WordPress
Site Mailer – SMTP Replacement, Email…1.4.3

Rating Breakdown

MC4WP: Mailchimp for WordPress

4.8/5(1,492 reviews)
5
92%
4
3%
3
1%
2
1%
1
3%

Site Mailer – SMTP Replacement, Email…

2.2/5(14 reviews)
5
29%
4
0%
3
0%
2
7%
1
64%

Recent Reviews

MC4WP: Mailchimp for WordPress Reviews

by jesushillman

Good but Limited

Works well for basic email setup & easy to connect with Mailchimp. UI is simple. But needs more flexibility in forms. Overall, a good plugin. tnx 👍

by Bentomen

Simple Mailchimp Connect

Good plugin for connecting Mailchimp with WP. Setup was pretty easy and forms started collecting emails without much hassle. UI is clean too. A few more design options would be nice, but overall works

by 4mifix

Just Started Using This API

I like it so far and will update this review as time goes on.

Site Mailer – SMTP Replacement, Email… Reviews

by petralearnsword

Site Mailer Glitch

I’ve been using Site Mailer for a while now. But I installed it for a new client and the plugin is not working. “Sorry there was a glitch. Try refreshing the page. if that does not resolve the issue t

by Chris

it forces you to set a Reply-To address

I’m unfortunately not satisfied with Site Mailer because it forces you to set a Reply-To address in the plugin settings. There is no option to leave this field empty. For websites that use advanced

by Svensonsan

Installed without my consent

This plugin suddenly appeared on my site without me ever installing it. I can only assume it was pushed through an Elementor update, which is completely unacceptable behavior. Plugins should never

Frequently Asked Questions

Is MC4WP: Mailchimp for WordPress or Site Mailer – SMTP Replacement, Email… more popular?
MC4WP: Mailchimp for WordPress has 1.0M+ active installations while Site Mailer – SMTP Replacement, Email… has 200K+. MC4WP: Mailchimp for WordPress is the more widely-used plugin as of April 2026.
Which has better ratings — MC4WP: Mailchimp for WordPress or Site Mailer – SMTP Replacement, Email…?
MC4WP: Mailchimp for WordPress has a 4.8/5 rating from 1,492 reviews, while Site Mailer – SMTP Replacement, Email… has a 2.2/5 rating from 14 reviews.
Are MC4WP: Mailchimp for WordPress and Site Mailer – SMTP Replacement, Email… free?
MC4WP: Mailchimp for WordPress is free and Site Mailer – SMTP Replacement, Email… is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — MC4WP: Mailchimp for WordPress or Site Mailer – SMTP Replacement, Email…?
As of April 2026, MC4WP: Mailchimp for WordPress has a 89% support resolution rate while Site Mailer – SMTP Replacement, Email… has a 100% rate.
Which plugin is updated more frequently?
MC4WP: Mailchimp for WordPress was last updated 1 week ago and Site Mailer – SMTP Replacement, Email… was last updated 1 month ago.

Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.