Thank you very much lavendervu2510 (@lavendervu2510).
I followed your recommendation, the emails are sent from my website but not received by the customer receiving email, the email log but WP Mail Logging plugin says the emails were sent but only the admin email was received but the customer is not received.
I deactivated the plugin to test and the email got send as it should so i think the issues is from the plugin, please kindly help check. I look forward to your swift response.