Sully

A simple, lightweight, yet effective plugin to enable two factor (2FA) authentication via email. You can enable this on an individual user basis, for all administrators, editors, or all accounts with one line of code in your <code>wp-config.php</code> file.
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WordPress is the world’s most popular content management system (CMS), with over 40% of all websites running on it. As such, it has become a prime target for hackers looking to exploit vulnerabilities to gain unauthorized access to websites. One of the best ways to enhance the security of a WordPress site is to enable two-factor authentication (2FA) for administrators.
<ul>
<li>Simply enable the plugin then edit a user account to enable 2FA for that individual user.</li>
<li>Please make sure your WordPress website sends and receives emails correctly. The best way is to use a SMTP plugin.</li>
</ul>
Check out our other plugins:
<ul>
<li>🎉 <a href="https://wordpress.org/plugins/media-library-file-size/" rel="ugc">Media Library File Size</a></li>
<li>✨ <a href="https://wordpress.org/plugins/single-post-page-export/" rel="ugc">Export Single Post Page</a></li>
<li>🙍‍♂️ <a href="https://wordpress.org/plugins/view-user-metadata/" rel="ugc">View User Metadata</a></li>
<li>🔠 <a href="https://wordpress.org/plugins/enable-turnstile-cloudflare-for-gravity-forms/" rel="ugc">Enable Turnstile (Cloudflare) for Gravity Forms</a></li>
<li>⭐️⭐️⭐️⭐️⭐️ <a href="https://ss88.us/plugins/gravity-forms-freescout?utm_campaign=OtherPlugins" rel="nofollow ugc">Gravity Forms to FreeScout</a></li>
</ul>

Two Factor (2FA) Authentication via Email

Enable one-click login with this WordPress Two-Factor Authentication (2FA) plugin, utilizing email for added security.

wpunicorn

<a href="https://wpsmspro.com/?utm_source=wporg&utm_medium=link&utm_campaign=website" rel="nofollow ugc">Ultimate SMS</a>: A powerful texting Plugin for WordPress, Receive SMS notifications as per the site’s activities, Inteagrate Your WordPress Website with Twilio API. 
Also, You can send SMS to subscribers of the newsletter, any number or admin for any notifications in WordPress. 
This plugin was created for this by using <a href="https://www.twilio.com/" rel="nofollow ugc">Twilio</a> API,One of the best SMS solutions on the market. And they’re reasonably priced and have an excellent API.
Here’s a list of what the plugin provides out of the box:
<ul>
<li>Custom function to easily send SMS messages to any number (including international ones)</li>
<li>Functionality to directly send a text message to any permissible number from the plugin settings page</li>
<li>Send Bulk SMS to all the users of the website or to a user role.</li>
<li>Send SMS Newsletter to all the users of the website or to a user role or to a custom list of numbers.Many premium features and options are integrated within this one.</li>
<li>Enable sending SMS notifications to the admin or any number about any activity on the website (New comment,New Post,..)</li>
<li>Hooks to add additional tabs on the plugin settings page to allow managing all SMS related settings from the same page</li>
<li>Basic logging capability to keep track of up to 100 entries</li>
<li>Mobile Phone User Field added to each profile (optional)</li>
<li>Shorten URLs using Bit.ly or Google URL Shortener API (optional)</li>
</ul>
Extend, Contribute, Integrate
Disclaimer: This plugin is not affiliated with or supported by Twilio, Inc. All logos and trademarks are the property of their respective owners.

Ultimate SMS Notifications – Messaging, Alerts & OTP

Send SMS/MMS notifications, OTP & 2FA messages, and WooCommerce updates with support for multiple gateways and plugin integrations.

Two Factor (2FA) Authentication via Email vs Ultimate SMS Notifications – Messaging, Alerts & OTP