Post SMTP – Complete Email… vs Site Mailer – SMTP Replacement, Email… (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
Post SMTP – Complete Email…
400K+ active installs
Free + Premium
Site Mailer – SMTP Replacement, Email…
200K+ active installs
Free
Quick Verdict
As of April 2026, Post SMTP – Complete Email… has a higher user rating (4.7/5 from 518 reviews) and leads in active installations (400K+ vs 200K+). Both are free + premium WordPress plugins. Post SMTP – Complete Email… has accumulated 18M+ total downloads while Site Mailer – SMTP Replacement, Email… has 1.8M+. Site Mailer – SMTP Replacement, Email… has a higher support resolution rate (100% vs 81%).
Detailed Comparison
| Metric | Post SMTP – Complete Email… | Site Mailer – SMTP Replacement, Email… | |
|---|---|---|---|
| Rating | 4.7/5 | ◄ | 2.2/5 |
| Total Reviews | 518 | ◄ | 14 |
| Active Installs | 400K+ | ◄ | 200K+ |
| Total Downloads | 18M+ | ◄ | 1.8M+ |
| Support Resolution | 81% | ► | 100% |
| Last Updated | 3 days ago | ◄ | 1 month ago |
| First Released | 2017 | 2024 | |
| Age | 9 years | 2 years | |
| WP Requires | 5.6.0+ | 6.6+ | |
| PHP Requires | 7.0+ | 7.4+ | |
| Business Model | Free + Premium | Free | |
| Latest Version | 3.9.1 | 1.4.3 |
Rating Breakdown
Post SMTP – Complete Email…
Site Mailer – SMTP Replacement, Email…
Download Trends
Over the past 30 days, Post SMTP – Complete Email… averaged approximately 11,652 daily downloads while Site Mailer – SMTP Replacement, Email… averaged 2,033.
Recent Reviews
Post SMTP – Complete Email… Reviews
Critical and high severity vulnerabilities over and over again
We’ve been using Post SMTP for years. Initially, we started with WP Mail SMTP, but the free version didn’t include logging, while Post SMTP did, and that occasionally came in handy. So we switched to
Great Plugin
Great Plugin easy to config and troubleshoot.
Great Support for the setup of PostSMTP
Aqib was very helpful in setting up PostSMTP on my site. The plug-in is working very well.
Site Mailer – SMTP Replacement, Email… Reviews
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
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
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
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Frequently Asked Questions
Is Post SMTP – Complete Email… or Site Mailer – SMTP Replacement, Email… more popular?
Which has better ratings — Post SMTP – Complete Email… or Site Mailer – SMTP Replacement, Email…?
Are Post SMTP – Complete Email… and Site Mailer – SMTP Replacement, Email… free?
Which plugin has better support — Post SMTP – Complete Email… or Site Mailer – SMTP Replacement, Email…?
Which plugin is updated more frequently?
Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.