Are you seeking a solution to take full control over Magento 2 SMTP configuration? Or you may need to use other reliable SMTP servers to protect your emails from spam. It is necessary to configure and send all outgoing emails by SMTP server that prevent your email from going into junk/spam folder of recipients.
However, Magento 2 doesn't work well with SMTP. Hence, we created Magento 2 SMTP extension. Using the extension, you can choose to send reliable emails from a local hosting or custom SMTP server. Also, you can test your email easily with debug mode. And it allows you to log all sent email and view message in detail.