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SMTP Agent: UBE Blocking

You can protect your NIMS system from UBE (unsolicited bulk email) or spam mail by blocking specified sites.

Provide the SMTP Agent UBE blocking settings > click Apply to save the settings.

Flags

Block Hosts in Blocked List
Restricts access to your NIMS system by selectively denying access. If this option is selected, the SMTP Agent refuses connections from any host with an IP address designated in the Blocked Hosts list. The Blocked Hosts list is defined below.

Deny Hosts Not in DNS
Provides reverse DNS lookups. When receiving messages from external systems, the SMTP Agent verifies that the sender's IP address has a corresponding host name published in DNS. If it doesn't, the SMTP Agent drops the connection.

RBL Check

Enable
Enable/Disable the SMTP Agent's lookup on the Real-time Black Hole List (RBL). RBL maintains a list of confirmed spammers and open relays.

RBL Servers
Type a list of RBL IP addresses, one per line. SMTP will then check against each one in the list. If the sender IP is found on any of the RBL lists, it will be refused.

Blocked Hosts
Type a list of disallowed IP address ranges, with one address per line. If Block Hosts in Blocked List is selected above, any hosts that fall within the designated IP address ranges will be refused connections to the current SMTP Agent.

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