Open up the configuration file of Postfix server /etcetera/postfix/main.cf and change smtpd_recipient_restrictions solution and incorporate the following choices such as this: The best-high quality templates originate from one of the most dependable ESPs which have analyzed them in opposition to A huge number of possibilities. So, stick with the gurus. https://www.hostscheap.com/business-email-server-setup-service