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Hello @mpbaweb
The screenshot image provided describes the issue’s cause. The spam rules in your SMTP server are identifying the emails sent from the website as spam. Our plugin calls the wp_mail WordPress function (https://developer.projectdmc.org/reference/functions/wp_mail/) and lets WordPress decide how to deliver the emails.
If you have installed and configured an SMTP connection plugin, WordPress will send the emails via the SMTP server, or the PHPMailer module in the web server otherwise.
I recommend installing and configuring an SMTP connection plugin on your website, and if the issue persists, please ask your hosting provider what rule is blocking the emails.
Best regards.