By default, only 2 KB of the original message will be sent back. This setting lets you specify a host that will be forwarded undeliverable messages. You can use the settings on the SMTP Security page to help protect your GroupWise system from malicious or accidental attacks. When this setting is turned off, the Internet Agent will accept messages from any smart host, but will also display a warning if the initiating host is not authentic. When this setting is turned on, the Internet Agent will refuse messages from a smart host if a DNS reverse lookup shows that the host's DNS A Record host name does not match its IP address.
Mailbomb protection is turned off by default.
You can turn it on by clicking the check box. 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 will be entirely discarded. If you want to prevent future mailbombs from the mailbomb sender you can identify the sender's IP address in the Internet Agent's operation screen.