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WordPress pluginwhat they say

SMTP Mailer

Configure a SMTP server to send email from your WordPress site. Configure the wp_mail() function to use SMTP instead of the PHP mail() function.

★★★★★4.6 (67) · 70k+ active installs
Free
Website ↗ WordPress.org ↗
what mrrlens sees
MRR · No price listedNo price in the listing
Opportunity—
Buyer threads · 30 d0
“With my own smtp credentials – it supposedly sending test message, but it simply doesn’t comply with CF7, there’s an error while sending form and that’s it.”
#1 complaint · Bugs/Reliability · 100% of complaints read · analysed Oct 29, 2026 · source

01Revenue

No price in the listing

3 daily snapshots · growth 30 d: —

Store data from the WordPress.org listing, refreshed daily. Updated 6 h ago. Listed since 2015.

02Why users leave SMTP Mailer

5★88%
4★0%
3★0%
2★3%
1★9%
Bugs/Reliability5 reviews · 100%

Test message reportedly sends, but Contact Form 7 submissions error and no email is delivered.

“With my own smtp credentials – it supposedly sending test message, but it simply doesn’t comply with CF7, there’s an error while sending form and that’s it.” source ↗

Sample: 5 recent complaints (1–3★ reviews) · clustered Oct 29, 2026 · complaints from Aug 2017–Jul 2024, none in the last 24 months — history, not today · each review labelled by a model, quotes verbatim

03How to build a better SMTP Mailer

Build difficultyMediumSMTP/Gmail auth variations and WordPress/CF7 compatibility need integration testing; no payments, regulation, hardware, or network effects.
Three build ideas that answer these complaintsIncluded in the day pass and Pro.
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04Who wants a better SMTP Mailer

0 buyer threads in the last 30 days name SMTP Mailer, and 1 more is in the same market.

05Questions about SMTP Mailer

How much revenue does SMTP Mailer make?

SMTP Mailer's listing publishes no price and no paid plan, so MRRLens shows no revenue estimate. It may still charge on its own website; a founder can verify the real figure.

What do users complain about most in SMTP Mailer?

Across 5 recent complaints, the most common is bugs/reliability (100%). Test message reportedly sends, but Contact Form 7 submissions error and no email is delivered.

What are the best SMTP Mailer alternatives?

The closest alternatives MRRLens found are WP SMTP Mailer, Configure SMTP and Solid Mail. The full list, with why users leave, is on the SMTP Mailer alternatives page.

How many people use SMTP Mailer?

SMTP Mailer lists 70k+ active installs on WordPress.org, rated 4.6 (67).

See the full x-ray of SMTP Mailer

Full 1-star breakdown with verbatim quotes, the build blueprint and every live thread — on every product.