The hostname or IP address of your destination email server, for example
mail.yourdomain.com. This is the mail server that receives email after it has
been checked for spam and viruses.
You should specify your mail server’s hostname rather than its IP address
so the destination mail server can be moved and DNS updated at any time
without any changes to the Barracuda Spam Firewall.
TCP port is the port on which the destination mail server receives inbound
email. This is usually port 25.
If you need to set up more than one domain or mail server, refer to Adding
New Domains on page 63.