Customized Spam Identification - Novell GROUPWISE 8 - ADMINISTRATION Administration Manual

Reject if PTR Record Does Not Exist: This setting lets you prevent messages if the sender's
host is not authentic.
When this setting is turned on, the Internet Agent refuses messages from a smart host if a DNS
reverse lookup shows that a PTR record does not exist for the IP address of the sender's host.
When this setting is turned off, the Internet Agent accepts messages from any host, but display
a warning if the initiating host is not authentic.
This setting corresponds with the Internet Agent's
Reject If PTR Record Does Not Match Sender's Greeting: Select this option if you
want the Internet Agent to reject messages from sending SMTP hosts where the sending
host's PTR record does not match the information that the SMTP host sends out when it is
initially contacted by another SMTP host. If the information does not match, the sending
host might not be authentic.
Flag Messages with an Invalid PTR Record as Junk Mail: Select this option to allow
messages from unidentified sources to be handled by users' Junk Mail Handling settings in
the GroupWise client rather than by being rejected by the Internet Agent. This gives users
more control over what they consider to be junk mail.
Enable Mailbomb Protection: Mailbomb protection is turned off by default. You can turn it
on by selecting this option.
Mailbomb Threshold: When you enable Mailbomb protection, default values are defined in
the threshold settings. The default settings are 30 messages received within 10 seconds. You
can change the settings to establish an acceptable security level.
Any group of messages that exceeds the specified threshold settings is entirely discarded. If
you want to prevent future mailbombs from the mailbomb sender, identify the sender's IP
address (by looking at the Internet Agent's console) and then modify the appropriate class of
service to prevent mail being received from that IP address (Access Control > Settings). For
more information, see
The time setting corresponds with the Internet Agent's
setting corresponds with the
4 Click OK to save the changes.
For additional protective startup switches, see
page 860.

47.2.5 Customized Spam Identification

Before GroupWise 7, you could use the
client Junk Mail Handling feature if they contained an x-spam-flag:yes in the MIME header. Starting
in GroupWise 7, you can configure as many strings as needed to identify junk mail and you can use
ConsoleOne to specify the strings.
1 In ConsoleOne, right-click the Internet Agent, then click Properties.
2 Click SMTP/MIME > Junk Mail.
Section 47.1.2, "Creating a Class of Service," on page
/mbcount switch.
Section 52.6.13, "Mailbomb and Spam Security," on
/xspam startup switch to flag messages for handling by the
/rejbs switch.
/mbtime switch. The message count
Managing Internet Access 777
764.