Smackcoders Inc.,

<p>WP SendGrid plugin enables easy to do one step configuration to switch all your WordPress emails via SendGrid or SMTP. Now you can send WordPress email using SendGrid API using our SendGrid WordPress Plugin</p>
<h4>Highlights</h4>
<ul>
<li>Sending mail via SendGrid or SMTP</li>
<li>Mail Logs can be accessed from WordPress.</li>
<li>Can verify campaign status like open, clicked, etc log view.</li>
</ul>
<h4>Other Useful Plugins & Addons By Smackcoders</h4>
<p>To <a href="https://wordpress.org/plugins/wp-ultimate-csv-importer/" rel="ugc">Import and Export WordPress Data as CSV or XML</a><br />
and <a href="https://www.smackcoders.com/wp-ultimate-csv-importer-pro.html" rel="nofollow ugc">for premium version of the plugin, you can get it here</a></p>
<p>The Leads Builder for WordPress to capture your webforms as leads to one of the top-ranking open source CRM, install the <a href="https://wordpress.org/plugins/wp-leads-builder-any-crm/" rel="ugc">WordPress Lead Form Data Collection to CRM</a> Plugin. Install one of the CRM of your choice with the additional add-ons listed below and keep both parent plugin and CRM add-on activated.<br />
* <a href="https://wordpress.org/plugins/wp-zoho-crm/" rel="ugc">Zoho CRM & Zoho CRM Plus</a><br />
* <a href="https://wordpress.org/plugins/wp-salesforce/" rel="ugc">Salesforce</a><br />
* <a href="https://wordpress.org/plugins/wp-sugar-free/" rel="ugc">SugarCRM</a><br />
* <a href="https://wordpress.org/plugins/wp-freshsales/" rel="ugc">Freshsales</a><br />
* <a href="https://wordpress.org/plugins/wp-tiger/" rel="ugc">Vtiger CRM</a></p>
<p>To know more about the premium bundled version, visit <a href="https://www.smackcoders.com/wp-leads-builder-any-crm-pro.html" rel="nofollow ugc">WordPress Lead Form Data Collection to CRM with unlimited features</a></p>


SendGrid for WordPress

WP SendGrid allows you to set your default WordPress emails through SendGrid

Shahjahan Jewel

WPManageNinja

Mahmudul Hasan Arif

Sheikh Heera

<h3>WordPress Mail SMTP Plugin For Any Email Services</h3>
<p>Are you having problems with your WordPress emails not sending? Or do you want to set what email address they are sent from? This plugin will solve all your email deliverability problems. FluentSMTP is the ultimate WP Mail Plugin that connects with your Email Service Provider natively and makes sure your emails are delivered 💯.</p>
<p>Our goal is to send your WordPress emails fast, secure, and have them reach the inbox.</p>
<p>Fluent SMTP plugin fixes your email delivery issue by connecting WordPress Mail with your email service providers. These integrations are native, so it will send the emails superfast.</p>
<p>Connect as many email Service Providers as you want, and FluentSMTP will route your transactional and marketing emails automatically. This is one of the unique features that FluentSMTP has to offer.</p>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/qnrTdQMNcuA?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span>
<h3>Why is FluentSMTP free?</h3>
<p>The FluentSMTP plugin is 100% free and open source. We will never monetize it. It’s a part of our “Five for the Future” participation, an initiative started by the WordPress Foundation.<br />
Our parent company <a title="WP Manage Ninja" href="https://wpmanageninja.com" rel="nofollow ugc">WPManageNinja LLC</a> builds products for WordPress businesses and has a very stable business model. We want to give back to the community, and FluentSMTP is part of that.</p>
<h3>🎉 Available Email Service Connections</h3>
<ul>
<li>Amazon SES</li>
<li>Gmail OAuth</li>
<li>Google Workspace OAuth</li>
<li>Outlook OAuth</li>
<li>SendGrid</li>
<li>Mailgun</li>
<li>Brevo (Sendinblue)</li>
<li>Pepipost</li>
<li>Postmark</li>
<li>Zoho ZeptoMail (TransMail)</li>
<li>SparkPost</li>
<li>SMTP2GO</li>
<li>Elastic Mail</li>
<li>Zoho via SMTP</li>
<li>Any SMTP email provider</li>
<li>More native integrations coming soon</li>
</ul>
<h3>🎉 Fluent SMTP features</h3>
<p>Fluent SMTP is the fastest and most advanced WordPress Mail SMTP plugin on the market. We crafted this plugin for speed, reliability and scalability.</p>
<ul>
<li>Real-Time Email Delivery</li>
<li>Email Routing to multiple email connections</li>
<li>Connect with Any Email Service Providers</li>
<li>Fallback Email Connection</li>
<li>Email Logging</li>
<li>Resend Emails</li>
<li>Detailed Reporting</li>
<li>Super fast UI powered by VueJS</li>
</ul>
<p>Most importantly, this plugin is free and will always be free.<br />
👉 <a href="https://fluentsmtp.com/why-we-built-fluentsmtp-plugin/" rel="nofollow ugc">Read why it’s 100% free (always)</a> 👈</p>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/GwmkX6zImWw?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span>
<h3>How does Fluent SMTP work?</h3>
<p>Fluent SMTP improves your WordPress mail by intercepting <code>wp_mail</code> calls, and then connecting with your email service providers to ensure deliverability. It uses a direct email service API to send emails faster and securely. It means emails are sent using the provider’s direct API. For your native SMTP connections, it uses the proper host, port, and credentials to send your WP mails.</p>
<h3>Email Logging and Debugging</h3>
<p>Fluent SMTP optionally logs your emails, so at any time you can check to see your site health. You can also resend your failed emails, or resend any previous emails from email logs.</p>
<h3>🎉 Amazon SES (Native API Connection)</h3>
<p>With Fluent SMTP SES Connection, you get the powerful, low-cost, high deliverability managed infrastructure from Amazon. With the support of Fluent SMTP, it’s super easy to set up and configure Amazon SES API and send all your WordPress emails. The integration is with amazon’s latest SES API so your emails will be delivered faster and the right way.</p>
<p>Fluent SMTP optimizes the API connection so it creates CURL-Tunneling to send your emails even faster. With Amazon SES connection, You can send emails faster than any other plugins.</p>
<h3>🎉 Gmail or Google Workspace (Native API Connection)</h3>
<p>Fluent SMTP – WP Mail Plugin provides you options to connect with your Gmail or Google Workspace emails and send emails over their API. It’s fast and secure.<br />
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/_d78bscNaX8?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span></p>
<h3>🎉 SendGrid API Connection</h3>
<p>SendGrid is the leading email sending service provider. You can rely on their globally distributed, cloud-based architecture for sending your WordPress Emails.</p>
<p>With Fluent SMTP, You can set up your SendGrid email service connection API in less than a minute. With this direct API connection, send your WordPress Mails fast and secure way.</p>
<p>Read about <a href="https://fluentsmtp.com/docs/set-up-the-sendgrid-driver-in-fluent-smtp/" rel="nofollow ugc">SendGrid connection documentation here</a></p>
<h3>🎉 Mailgun Email API Connection</h3>
<p>Mailgun is another leading email sending service provider and trusted by 225,000+ businesses. You can rely on their globally distributed, cloud-based architecture for sending your WordPress Emails.</p>
<p>Get your message to the right person at the right time with global infrastructure and industry expertise you can rely on.</p>
<p>With Fluent SMTP connection, You can set up your Mailgun email service connection in less than a minute. This is also a direct API connection so it’s faster than their SMTP connection.</p>
<p>Read about <a href="https://fluentsmtp.com/docs/configure-mailgun-in-fluent-smtp-to-send-emails/" rel="nofollow ugc">Mailgun connection documentation here</a></p>
<h3>🎉 Sendinblue API Connection</h3>
<p>Sendinblue is a platform for growing businesses and it has a great transactional email service. They serve more than 80,000 companies around the world and send millions of emails every day.</p>
<p>If you use Sendinblue then with the help of Fluent SMTP, You can easily connect with its API and send Your WordPress emails via an API connection.</p>
<p>Read about <a href="https://fluentsmtp.com/docs/setting-up-sendinblue-mailer-in-fluent-smtp/" rel="nofollow ugc">Sendinblue connection documentation here</a></p>
<h3>🎉 Pepipost Email API Connection</h3>
<p>Pepipost is a complete sending partner with a user-friendly dashboard and many extensive functions such as statistics and real-time information.</p>
<p>With Fluent SMTP connection, You can set up your Pepipost email service connection in less than a minute. With a direct API connection so it’s faster than their SMTP connection.</p>
<p>Read about <a href="https://fluentsmtp.com/docs/set-up-the-pepipost-mailer-in-fluent-smtp/" rel="nofollow ugc">Pepipost API connection documentation here</a></p>
<h3>🎉 SparkPost Email API Connection</h3>
<p>SparkPost is a great email sending service with lots of analytics features.<br />
With Fluent SMTP, You can set up your SparkPost email service connection with your WordPress in less than a minute.</p>
<p>Read about <a href="https://fluentsmtp.com/docs/configure-sparkpost-in-fluent-smtp-to-send-emails/" rel="nofollow ugc">SparkPost connection documentation here</a></p>
<h3>🎉 Elastic Email API Connection</h3>
<p>Elastic Email is a great solution for sending transactional and marketing emails with a user-friendly dashboard and many extensive functions such as statistics and real-time information. Fluent SMTP plugin is fully compatible with their official API and you can use it to send your WordPress emails via Elastic Email</p>
<h3>🎉 Outlook or Office365 API Connection</h3>
<p>Fluent SMTP provides you options to connect with your Outlook or Office 365 emails and send emails over their API. It’s fast and secure. Using oAuth2 authentication system for the connection, You can easily setup the connection and send your emails with Office 365 / Outlook emails.</p>
<p>Read the documentation for <a href="https://fluentsmtp.com/docs/setup-outlook-with-fluentsmtp/" rel="nofollow ugc">connecting Office 365 Email with WordPress</a></p>
<h3>🎉 SMTP2GO Email API Connection</h3>
<p>SMTP2GO is a convenient solution for sending transactional and marketing emails with a user-friendly dashboard and many extensive functions such as statistics and real-time information. Fluent SMTP plugin is fully compatible with their official API and you can use it to send your WordPress emails via SMTP2Go</p>
<h3>🎉 Other SMTP</h3>
<p>Fluent SMTP plugin works with all major email services that offer SMTP connections such as Gmail, Yahoo, Microsoft Live, Zoho Mail, YandexMail, and any other email sending services.</p>
<p>You can set the following options:</p>
<ul>
<li>Specify an SMTP Host.</li>
<li>Specify an SMTP Port.</li>
<li>Choose the Encryption option.</li>
<li>Choose to use SMTP authentication or not.</li>
<li>Specify the SMTP username and password.</li>
<li>That’s it 💯</li>
</ul>
<p>Read about <a href="https://fluentsmtp.com/docs/set-up-fluent-smtp-with-any-host-or-mailer/" rel="nofollow ugc">SMTP connection documentation here</a></p>
<h3>🚀 MODERN. POWERFUL. SUPER FAST 🚀</h3>
<ul>
<li>Built with VueJS as a Single-page Application.</li>
<li>Super fast and lean interface so anyone can use it without a learning curve.</li>
<li>Super awesome Dashboard with charts, graphs, and stats to show how your emails are doing.</li>
</ul>
<h3>🚀 Automatic Email Routing 🚀</h3>
<p>With Fluent SMTP’s unique multiple connection driver features, You can add as many email connections as you want. Based on your From Email Address, Fluent SMTP will route your emails to the appropriate email driver and send them securely. This is one of the unique and useful features that Fluent SMTP offers.</p>
<p>Now, you can route your transactional emails with one connection and marketing emails with another connection.</p>
<h3>🚀 Email Logs and Reporting 🚀</h3>
<p>Do you want to know how many and which emails your site is sending? Fluent SMTP got you covered. With powerful and super-fast email reporting and logs, you can easily view your WordPress emails. You can also view charts and graphs about your daily email stats. Also, you can resend any emails anytime you want. This is super helpful for storing emails for your records, auditing outgoing emails, and debugging during site development.</p>
<p>Optionally, You can turn off this feature, and then only failed emails will be logged so you can take a look. Fluent SMTP uses a custom database table so your WordPress tables will not be bloated (we care).</p>
<h3>🚀 Real-time Notifications on Email Failures via Telegram, Slack, and Discord 🚀</h3>
<p>Fluent SMTP has a unique feature that will notify you in real-time if any email fails to send. You can set up your Telegram, Slack, or Discord channel and Fluent SMTP will send you a notification if any email fails to send. This is super helpful for debugging and monitoring your site’s email health.</p>
<h3>🚀 Security 🚀</h3>
<p>Fluent SMTP is built by professionals and security and scalability in mind. Fluent SMTP provides several options for you to keep your email sending secure and safe.</p>
<ul>
<li>Ability to store your SMTP / API credentials in wp-config.php.</li>
<li>Ability to auto-delete old email logs.</li>
<li>Fluent SMTP connects your email service providers directly via an API.</li>
</ul>
<p>= 🚀Plain-Text Support with HTML Email on the fly 🚀=<br />
FluentSMTP will automatically convert your HTML email to Plain-Text email on the fly. Then it will send your emails with multi-part mime type. This is super helpful for email deliverability and spam score. Please make sure, you activate that from the settings.</p>
<h3>👉 Credits 👈</h3>
<p>Fluent SMTP is built by <a href="https://wpmanageninja.com" rel="nofollow ugc">WPManageNinja LLC</a>. And yes, It’s built by the creator of popular plugins like <a href="https://wordpress.org/plugins/fluentform" rel="ugc">FluentForms</a>, <a href="https://wordpress.org/plugins/fluent-crm" rel="ugc">FluentCRM</a>, <a href="https://wordpress.org/plugins/ninja-tables/" rel="ugc">Ninja Tables</a>.</p>
<p>Fluent SMTP is a 100% free and open source plugin and we will never release a pro version. This does not mean that it lacks features. Our aim is to provide the ultimate SMTP/Email Service connection plugin for your WordPress Mails. We wrote <a href="https://fluentsmtp.com/why-we-build-fluentsmtp-plugin/" rel="nofollow ugc">an article about why we made this plugin</a> and our plans for Fluent SMTP.</p>
<p>The full source code is hosted on GitHub and you are welcome to contribute to the development of this awesome WP Mail Plugin.<br />
👉 <a href="https://github.com/WPManageNinja/fluent-smtp" rel="nofollow ugc">View on GitHub</a> 👈</p>
<h4>Compatible With..</h4>
<ul>
<li><a href="https://wordpress.org/plugins/fluentform/" rel="ugc">Fluent Forms – The Fastest Form Builder Plugin</a></li>
<li><a href="https://wordpress.org/plugins/fluent-crm/" rel="ugc">FluentCRM – Email Marketing Automation, Email Newsletter and CRM Plugin for WordPress</a></li>
<li><a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a></li>
<li><a href="https://elementor.com/features/form-widget/" rel="nofollow ugc">Elementor Forms</a></li>
<li><a href="https://wordpress.org/plugins/contact-form-7/" rel="ugc">Contact Form 7</a></li>
<li><a href="http://www.gravityforms.com" rel="nofollow ugc">Gravity Forms</a></li>
<li><a href="https://wordpress.org/plugins/wpforms-lite/" rel="ugc">Contact Form by WPForms</a></li>
<li><a href="https://wordpress.org/plugins/forminator/" rel="ugc">Forminator – Contact Form</a></li>
<li><a href="https://wordpress.org/plugins/ninja-forms/" rel="ugc">Ninja Forms Contact Form</a></li>
<li><a href="https://wordpress.org/plugins/form-maker/" rel="ugc">Form Maker by 10Web</a></li>
<li><a href="https://wordpress.org/plugins/formidable/" rel="ugc">Formidable Form Builder</a></li>
<li><a href="https://wordpress.org/plugins/give/" rel="ugc">GiveWP – Donation Plugin</a></li>
<li><a href="https://wordpress.org/plugins/si-contact-form/" rel="ugc">Fast Secure Contact Form</a></li>
<li><a href="https://wordpress.org/plugins/visual-form-builder/" rel="ugc">Visual Forms Builder</a></li>
<li><a href="https://wordpress.org/plugins/contact-form-builder/" rel="ugc">Contact Form Builder</a></li>
<li><a href="https://wordpress.org/plugins/planso-forms/" rel="ugc">PlanSo Forms</a></li>
<li><a href="https://wordpress.org/plugins/fluent-crm" rel="ugc">FluentCRM</a></li>
<li><a href="https://wordpress.org/plugins/sendpress/" rel="ugc">SendPress Newsletters</a></li>
<li><a href="https://wordpress.org/plugins/wp-html-mail/" rel="ugc">WP HTML Mail</a></li>
<li><a href="https://wordpress.org/plugins/wpforms-lite/" rel="ugc">WPForms Lite</a></li>
<li><a href="https://wordpress.org/plugins/wpforms-lite/" rel="ugc">WP Forms Pro</a></li>
<li><a href="https://wordpress.org/plugins/email-templates/" rel="ugc">Email Templates</a></li>
<li>.. and every other plugin that uses the WordPress API <a href="https://codex.wordpress.org/Function_Reference/wp_mail" rel="nofollow ugc">wp_mail</a> to send mail!</li>
</ul>
<h3>Easy Migration from WP Mail SMTP by WPForms</h3>
<p>If you currently using WP Mail SMTP by WPForms plugin and want to migrate to FluentSMTP then that is super easy. Within few seconds you are migrated.</p>
<ul>
<li>Just install FluentSMTP plugin to your site.</li>
<li>Go to Settings -> FluentSMTP.</li>
<li>It will automatically show previous configuration from “WP Mail SMTP by WPForms”.</li>
<li>Click “Import From WP Mail SMTP” button and that’s it.</li>
<li>Disable “WP Mail SMTP by WPForms” and enjoy FluentSMTP.</li>
</ul>
<h3>Once Click Migration from Easy WP SMTP</h3>
<p>If you currently using Easy WP SMTP plugin and want to migrate to FluentSMTP then that is super easy. Within a few seconds you are migrated from “Easy WP SMTP”.</p>
<ul>
<li>Just install FluentSMTP plugin to your site.</li>
<li>Go to Settings -> FluentSMTP.</li>
<li>It will automatically show previous configuration from “Easy WP SMTP”.</li>
<li>Click “Import From Easy WP SMTP” button and that’s it.</li>
<li>Disable “Easy WP SMTP” and enjoy FluentSMTP.</li>
</ul>
<h3>What’s Next</h3>
<p>If you like this plugin, then consider checking out our other plugins:</p>
<ul>
<li><a href="https://wordpress.org/plugins/fluent-crm/" rel="ugc">FluentCRM – Email Marketing Automation and CRM Plugin for WordPress</a></li>
<li><a href="https://wordpress.org/plugins/fluentform/" rel="ugc">Fluent Forms – Fastest WordPress Form Builder Plugin</a></li>
<li><a href="https://wordpress.org/plugins/fluent-support/" rel="ugc">WordPress Helpdesk and Customer Support Ticket Plugin</a></li>
<li><a href="https://wordpress.org/plugins/ninja-tables/" rel="ugc">Ninja Tables – Best WP DataTables Plugin for WordPress</a></li>
<li><a href="https://wordpress.org/plugins/ninja-charts/" rel="ugc">Ninja Charts – Best WP Charts Plugin for WordPress</a></li>
<li><a href="https://wordpress.org/plugins/wp-payment-form/" rel="ugc">Paymattic – Simple Payment Donations & Subscriptions Plugin</a></li>
</ul>


FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider

Very good plugin. Great work, keep it up.
Thank you!

Amazing


I'm converting dozens of sites over to this from Post SMTP.  Post SMTP is not bad this is just better. Why?  Because it:- cleanly supports multiple services, I can easily us AWS SES, Google Workspace, SendGrid and SendInBlue others all on the same site- cleanly support fallbacks if a service fails. - Great email logging with good search functionality.  This was always on of my sticking points with Post SMTP (bad logging although they say they're improving it).I really still want to get basic SMTP support into core, but until then, or as long as API connections are required, this is your best bet by far. 


Better than what I've used for 10 years


FluentSMTP is undeniably one of the finest free SMTP plugin for WordPress. Its seamless integration and intuitive setup make sending emails a breeze. With robust features and excellent compatibility, it ensures reliable email delivery. The plugin's user-friendly interface and efficient support elevate its usability. If you seek a top-tier SMTP solution without breaking the bank, FluentSMTP is your go-to choice.


Finest free SMTP plugin


Great product that is fully open source and consistently adding new features. Plugins like these are contributing to make WordPress and the community better for everyone.



Five stars all the way.


Great product that's contributing to make WordPress and the community better


It works well, and was easy to set up. I really like the logs and extras.


Works well


By far the easiest way to setup smtp and includes valuable tooling out of the box.  


Simply works


No problem connecting to any SMTP server. I personally recommend it.


1st Class


FluentSMTP is an exceptional SMTP plugin for WordPress, offering a seamless and efficient way to ensure email deliverability. Designed with performance in mind, it supports multiple SMTP providers, including Gmail, Amazon SES, Outlook, and custom SMTP servers, making it a versatile choice for any site.



One of its standout features is the ability to configure multiple email connections and route emails dynamically based on the sender address. This flexibility is particularly useful for businesses managing various email services. Additionally, FluentSMTP provides detailed email logging and insights, allowing users to track email delivery status and troubleshoot issues effortlessly.



The setup process is straightforward, with an intuitive interface that simplifies configuration, even for those without technical expertise. FluentSMTP also integrates seamlessly with popular WordPress plugins, ensuring compatibility with WooCommerce, Contact Form 7, and other essential tools.



Moreover, FluentSMTP is completely free and open-source, making it a cost-effective alternative to premium SMTP solutions. The absence of sending limits and its robust feature set make it a top-tier choice for WordPress users seeking a reliable SMTP solution.



Pros:




Supports multiple SMTP services



Easy setup and user-friendly interface



Detailed email logging and tracking



Free and open-source



Seamless integration with WordPress plugins




Cons: 




Lacks built-in email template customization



Advanced configurations may require some technical knowledge




In any case, FluentSMTP is a powerful and dependable SMTP plugin that ensures optimal email deliverability. Its extensive features, ease of use, and free availability make it one of the best choices for WordPress users. Whether running a small blog or managing a large eCommerce store, FluentSMTP is a must-have plugin for handling outgoing emails efficiently.


A Powerful and Reliable SMTP Solution for WordPress


If you are looking for an SMTP solution, look no further.



We are a WordPress solutions agency and have tried almost every SMTP plugin as SMTP is vital for marketing from the site. We have now settled on Fluent SMTP because it works well, is easy to configure and there are no big up-sells. The logs and notifications also are a great plus. 



This is without doubt my go-to plugin for any of my clients' sites.


This is the one!

Great plugin and support :)


This plugin is good, as things should be good! 


Very nice effort!


Highly recommended. Lightweight, purely functional, and completely free of the typical 'Pro-version' clutter.


Great


I tried them all and this wins by far. Super easy to configure, supports all major SMTP relay providers, testing and logging are very helpful, and all this for free! This could easily be a premium plugin and worth every cent. Bravo! 👏


Best SMTP Plugin on the Market

The Ultimate Forever Free Mail SMTP Plugin for WordPress. Connect with any SMTP, SendGrid, Mailgun, Amazon SES, Brevo, Postmark, Sparkpost, Google...

SendGrid for WordPress vs FluentSMTP – WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider