Security Settings

Use this property page to configure the security settings for the GroupWise^® Internet Agent. For example, mailbombs or spam from the Internet can potentially harm your GroupWise messaging environment. You can use the security settings to help protect your GroupWise system from malicious or accidental spam attacks.

Reject If PTR Record Does Not Exist
Select this option to instruct the Internet Agent to reject messages from unidentified sources. An unidentified source is defined as a sending SMTP host that does not have a PTR (pointer) record. A PTR record provides the mapping between the hostname and the corresponding IP address of the sending SMTP host. This setting lets you reject messages if the sending host is not authentic.

When this setting is turned on, the Internet Agent refuses messages from a smart host if a reverse DNS lookup shows that a PTR record does not exist for the IP address of the Internet Agent's host.

When this setting is turned off, the Internet Agent accepts messages from any host, but it displays a warning if the initiating host is not authentic.

This setting corresponds with the Internet Agent's /rejbs switch.

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
Turn on this option to protect your system against mailbombs (spam). With mailbomb protection turned on, if the Internet Agent receives a certain number of messages (the default is 30) from the same host or IP address within a specific time interval (the default is 10 seconds), it discards the messages.

Mailbomb Threshold
Use this setting to change the mailbomb threshold settings. The default settings are 30 messages received within 10 seconds.

Any group of messages that exceeds the specified threshold settings will be 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), then modify the appropriate class of service to prevent mail being received from that IP address (Access Control tab > Settings page).

The time setting corresponds to the Internet Agent's /mbtime switch. The message count setting corresponds to the /mbcount switch.

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