FolioVision

This plugin reconfigures the wp_mail() function to use SMTP instead of mail() and creates an options page that allows you to specify various options.
You can set the following options:
<ul>
<li>Specify the from name and email address for outgoing email.</li>
<li>Choose to send mail by SMTP or PHP’s mail() function.</li>
<li>Specify an SMTP host (defaults to localhost).</li>
<li>Specify an SMTP port (defaults to 25).</li>
<li>Choose SSL / TLS encryption (not the same as STARTTLS).</li>
<li>Choose to use SMTP authentication or not (defaults to not).</li>
<li>Specify an SMTP username and password.</li>
</ul>
Also adds subject to headers for SendGrid Activity Screen. SengGrid is a powerful SMTP service, however it’s Activity Log screen misses the message subjects. Our plugin adds that back in!

WP Mail SMTP SendGrid Edition

Based on WP Mail SMTP. Also adds subject for display on SendGrid Activity Screen.

Elastic Email

rafkwa

Elastic Email Sender allows you to connect your WordPress with our powerful, low-cost Elastic Email API and start sending marketing or transactional emails! 
Please follow the information below and find out more about how we can help you send your emails in a more efficient way. 
In case of any questions or concerns, feel free to contact us anytime.
What is the Elastic Email Sender plugin?
The Elastic Email Sender plugin is an easy way to maintain all the aspects related to your email campaigns. From creating and sending your emails to monitoring and managing campaign stats. 
Elastic Email Sender replaces the WordPress default wp_mail() function by using API integration with Elastic Email to send an outgoing email from your WordPress installation. 
Thanks to this, you can track all the parameters of your delivery, use Private IP addresses to get full control over your sending, maintain reputation and delivery and secure your data better than ever. You can also use your own domain and analyze your data with ease.
Elastic Email Sender is compatible with almost every solution available on the market including <a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a>, <a href="https://wordpress.org/plugins/contact-form-7/" rel="ugc">Contact Form 7</a>, <a href="https://wordpress.org/plugins/ninja-forms/" rel="ugc">Ninja Forms</a>, <a href="https://wordpress.org/plugins/flamingo/" rel="ugc">Flamingo</a>, <a href="https://wordpress.org/plugins/caldera-forms/" rel="ugc">Caldera Forms</a>, <a href="https://wordpress.org/plugins/bbpress/" rel="ugc">bbPress</a>
How to get started? 
Just sign into your <a href="https://app.elasticemail.com/marketing/settings/new/create-api" rel="nofollow ugc">Elastic Email account</a>, copy the API Key. Next, please login to your WordPress dashboard, add the <a href="https://wordpress.org/plugins/elastic-email-sender/" rel="ugc">Elastic Email Sender</a> plugin and paste there the API Key from your Elastic Email account.
<h3>Translations</h3>
You can translate Elastic Email Sender on <a href="https://translate.wordpress.org/projects/wp-plugins/elastic-email-sender" rel="nofollow ugc">translate.wordpress.org</a>.

Elastic Email Sender

This plugin instantly solves my problems. I have Elastic email through Cloudways, and I install this plugin, add my API key, and it instantly resolves my email issues. 

Excellent plugin!

Reconfigures wp_mail() to send email using Elastic Email API instead of SMTP.

WP Mail SMTP SendGrid Edition vs Elastic Email Sender