Sophisticated certificates: Use advanced certificates when you want some thing more customizable than Universal SSL but nonetheless want the benefit of SSL certificate issuance and renewal. nano /choose/postal/config/postal.yml Just scroll down and Find the choice for DNS. Then exchange many of the sample hostnames together with your very own hostname. https://josuezlvgq.theblogfairy.com/25920455/top-guidelines-of-zimbra-migration