You can protect your system against mailbombs (spam). With mailbomb protection enabled, 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.
To enable mailbomb protection or configure the mailbomb settings:
In ConsoleOne, right-click the Internet Agent object, then click Properties.
Click SMTP/MIME > Security Settings to display the Security Settings page.
Turn on the Enable Mailbox Protection option.
In the Mailbomb Threshold fields, select the message number and time interval to be used.
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. For more information, see Creating a Class of Service.
Click OK to save your changes.