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There are many SMTP plugins for WordPress, but there are still many troubleshoots when sending email messages via WordPress. With WP Mail REST-API you can send emails outside of WordPress and this reduces the number of failed sendings.
Create a webhook (trigger) on Zapier, Integromat, Automate, Workato, Microsoft Flow or a service of your choice. Save your Webhook directly in WP Mail REST-API and click on Test Webhook. Now change to your Webhook provider and create an SMTP dispatch as action. 
WP Mail REST-API provides you with the following variables for each dispatch:
<ul>
<li>to</li>
<li>subject</li>
<li>message in html</li>
<li>message in text</li>
<li>from name</li>
<li>from email</li>
<li>attachments</li>
</ul>
WP Mail REST-API is the answer to the often asked question, “How to fix WordPress not sending Email Issue. 
There are many reasons why sending emails with WordPress fails. For example, your WordPress firewall or your hosting company’s firewall may prevent you from sending messages for security reasons. If your message is sent externally via Webhook and an SMTP as action, you have simply solved your problem.
Of course you can also connect WP Mail REST-API with Outlook, Gmail, Hotmail, SMTP and other providers. If you want, you can also register and control every sent email in Google Sheet (as an action).

WP Mail REST-API

There are many SMTP plugins for Wordpress, but there are still many troubleshoots when sending email messages via Wordpress.

Lana Codes

Tester plugin to try WordPress email sending function.
<h4>Lana Codes</h4>
<a href="https://lana.codes/product/lana-email-tester/" rel="nofollow ugc">Lana Email Tester</a>

WP Mail REST-API vs Lana Email Tester