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How to configure WordPress to send mail via SMTP?
2. Go to Domains> example.com > Wordpress > Plugins and install an SMTP plugin (make a search by the word "SMTP" and choose the one to install)
3. Log in to WordPress admin panel and open Settings > SMTP mail. Specify the external SMTP hostname and port, credentials to connect to it.
4. Send a test message (usually, plugins have such functionality):
By default, WordPress uses the PHP mail function to send email notifications. However, most WordPress hosting companies restrict usage of this function to prevent abuse and spam. So, to make Wordpress use SMTP, it is required to install and configure WordPress SMTP plugins by the above steps.