You can conserve Scanner resources by limiting inbound connections to only IP 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.
If you accept mail only from selected hosts, and your Scanner is not at the gateway, you must add all upstream mail servers. Add the IPv4 and IPv6 addresses, CIDR blocks, or netmasks of upstream mail servers on both the SMTP and Internal Mail Hosts tabs of the Edit Host Configuration page. Symantec Messaging Gateway rejects email from unspecified upstream servers.
Accept inbound mail connections from only the following IP addresses
Select this option if you want the Scanner to accept only connections from the addresses that you check in the Inbound Mail Acceptance IP Addresses list.
Then in the list, check the IP addresses from which you want this Scanner to accept inbound mail.
Proceed to the next step.
Optionally, under Inbound Mail Acceptance, do any of the following tasks:
To manually add an IP address
Click Add and type the host name, or IPv4 address, or IPv6 address of a local domain from which you want to filter inbound email.
You can specify individual IPv6 addresses in any standard IPv6 format. IPv6 addresses are stored and displayed in shortened format. Ranges are expressed in CIDR notation, as a combination of an address part and a prefix.
To edit an IP address
Check the host name or IP address of the email client whose settings you want to change, click Edit, then make the necessary changes.
To delete one or more IP addresses
Check the addresses or domains from which you no longer want to accept inbound connections and click Delete to delete them from the list.
To delete all of the existing addresses or domains, click Delete All.
To import IP addresses
Click Import, browse to the file location, and click Import.
You can import files with comma, semicolon, space, and tab delimiters.
To export IP addresses
Click Export and specify the name of the export file and location where you want to save it.
Click Save or check Apply above settings to all Scanners and then click Save.
Imported Document ID: HOWTO92432
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