KitCode

OneClick Form Lite adds a lightweight contact form to your WordPress site via shortcode:
<ul>
<li>Shortcode: [oneclickform]</li>
<li>Fields: Name, Email, Subject, Message + GDPR consent checkbox</li>
<li>Anti-spam: honeypot + server-side rate limiting</li>
<li>Delivery modes:
<ul>
<li>WordPress wp_mail()</li>
<li>Built-in SMTP</li>
<li>File mode (writes messages to your uploads directory)</li>
</ul>
</li>
<li>Optional Google reCAPTCHA v3 (score-based)</li>
<li>Translations: EN (default) + FR, ES, PT-BR (via included .mo files)</li>
</ul>
Important notes: 
* This plugin does NOT store submitted messages in the WordPress database. 
* Messages are delivered by email (wp_mail/SMTP) or written to files (File mode). 
* Your host/mail provider may store emails in logs and mailboxes. 
* No minified/compiled assets are shipped with this plugin. All distributed CSS/JS is human-readable.
Documentation is included in the plugin: 
docs/oneclick-form-lite-user-guide.html
<h3>Source code</h3>
The plugin ships unminified, human-readable JS/CSS source files. No build process is used.
<h3>External services</h3>
1) This plugin can optionally integrate Google reCAPTCHA v3 to help prevent spam form submissions.
When enabled: 
– The visitor’s browser loads Google’s reCAPTCHA script: 
 https://www.google.com/recaptcha/api.js?render=YOUR_SITE_KEY 
– The browser communicates with Google to obtain a reCAPTCHA token.
On form submission: 
– The plugin sends the reCAPTCHA token to Google for verification: 
 https://www.google.com/recaptcha/api/siteverify 
– The verification request includes the token and the submitter’s IP address (remoteip) when available.
Service provider: Google LLC 
Terms of service: https://policies.google.com/terms 
Privacy policy: https://policies.google.com/privacy
2) This plugin can also send emails via an SMTP server configured by the site administrator (optional).
When SMTP is enabled and an email is sent: 
– The plugin connects to the configured SMTP host and port. 
– Email data is transmitted to the SMTP server in order to deliver the message.
Data sent to the SMTP server may include: 
– Sender and recipient addresses, subject, message content 
– Technical email headers 
– Authentication data (username/password) if configured by the site administrator
Service provider: The SMTP provider selected by the site administrator (e.g., hosting provider, Google Workspace, Microsoft 365, etc.) 
Terms of service: See the selected SMTP provider’s terms 
Privacy policy: See the selected SMTP provider’s privacy policy

OneClick Form Lite

Lightweight contact form with built-in SMTP, optional file delivery, and Google reCAPTCHA v3.

Denis V (Artprima)

AP HoneyPot WordPress Plugin, based on Jan Stępień’s http:BL, allows you 
to verify IP addresses of clients connecting to your blog against the Project 
Honey Pot database. Thanks to http:BL API you can quickly check whether your 
visitor is an email harvester, a comment spammer or any other malicious 
creature. Communication with verification server is done via DNS request 
mechanism, which makes the query and response even quicker. Now, thanks 
to AP HoneyPot WordPress Plugin any potentially harmful clients are denied 
from accessing your blog and therefore abusing it.
<h4>Your Feedback Matters</h4>
Bugs to report? Feature requests? Criticism? New ideas? We want to hear from 
you! Do not hesitate. Get in touch with us and share your views.

AP HoneyPot WordPress Plugin

Hard to believe I've been using this fro over 3 years, and the previous one before for even longer. No I wonder this is still being maintained, but still using in the meantime. 

Updated 3 years ago and still works great

AP HoneyPot WordPress Plugin allows you to verify IP addresses of clients connecting to your blog against the Project Honey Pot database.

OneClick Form Lite vs AP HoneyPot WordPress Plugin