Table: Scanner email settings describes the tasks that you can perform to configure and modify Scanner inbound email settings and outbound email settings. You can perform any of these tasks as needed in any order.
Table: Scanner email settings
Ensure that you understand about Scanner email settings before you perform any tasks.
Scanner email settings let you control various aspects of inbound and outbound message flow. You can limit the IP addresses from which Symantec Messaging Gateway accepts email messages. You can also control where Symantec Messaging Gateway delivers filtered email.
You can reduce the volume of email that any one Scanner filters by configuring separate inbound and outbound Scanners. Even if you use only one Scanner to filter both inbound email and outbound email, you can configure various SMTP settings to control message flow.
You can change the IP address or port number or add an IPv6 address through which a Scanner accepts inbound mail connections. You can also designate whether or not the Scanner accepts inbound TLS-encrypted connections.
You can conserve Scanner resources by limiting inbound connections to only IPv4 addresses or IPv6 addresses from which you want the Scanner to filter email. By allowing connections from only certain IP addresses and domains, you exclude all other inbound clients from sending messages at connection time.
After a Scanner filters inbound email, the MTA relays filtered email to a mail server for delivery to recipients. When you configure email delivery for an inbound-only or combined inbound and outbound Scanner, you designate the default local and non-local hosts where filtered inbound mail is routed.
You can change the IP address or port number or add an IPv6 address where a Scanner accepts outbound mail connections. You can also designate whether or not the Scanner accepts outbound TLS-encrypted connections.
You can configure a Scanner to accept outbound connections from an unlimited number of mail servers. By allowing connections from only certain IPv4 addresses or IPv6 addresses and domains, you exclude all other hosts from sending messages at connection time.
An outbound Scanner relays filtered email to a local or non-local mail server for delivery to recipients. When you configure email delivery for an outbound-only Scanner or a combined inbound and outbound Scanner, designate the IPv4 addresses and port numbers for both local and non-local mail hosts where the outbound mail that has been filtered is relayed.
You can designate a limited number of mail servers to relay outbound email to the Internet or the next hop in your network. Multiple downstream servers can be used for load balancing or for failover support of the primary mail server for local delivery.
Specify how you want Symantec Messaging Gateway to handle bad messages.
Symantec Messaging Gateway's bad message handling feature lets you specify how many times the system scans a potentially malformed message before it classifies it as such. Symantec Messaging Gateway then places it in the bad message queue.