How To Configure WordPress SMTP
1. Login in to your WordPress admin portal via domain.com/wp-admin
2. Navigate to Add New under Plugins.
3. Look for SMTP plugins such as SMTP mailer or WP Mail SMTP.
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4. Once it has been install, may navigate to the plugin settings from Setting (In my case, I will be using SMTP mailer).
5. You would need to ensure that the SMTP username is a legit/valid email on your hosting.
6. Basic settings will be as below:
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Here is some article about What You Need to Know About WordPress Plugins and Cybersecurity.