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. |