Procedure

1. Go to Sender Filtering → Rules.
   The Rules screen appears with five tabs, one for each type of threat.
2. Click the SMTP Traffic Throttling tab.
   The SMTP Traffic Throttling screen appears.
3. Optional: Select the IP-based throttling check box and configure the following:
   • Duration to monitor: The length of time that IMSVA monitors email traffic to see if the number of messages from a single IP address exceeds the maximum you set.
   • Maximum connections: The maximum number of connections allowed for a single IP address.
   • Maximum messages: The maximum number of email messages that can be sent from a single IP address.
   • Triggering action: Block temporarily is the only action that will be triggered.
     Block temporarily: Block messages from the IP address temporarily and allow the upstream MTA to try again after the block duration ends.
   • Block duration: The length of time that IMSVA will block messages from the IP address.
4. Optional: Select the Sender-based throttling check box and configure the following:
   • Duration to monitor: The amount of time that IMSVA monitors email traffic to see if the number of messages from a single sender exceeds the maximum you set.
   • Maximum messages: The maximum number of email messages that can be sent from a single sender.
   • Triggering action: Block temporarily is the only action that will be triggered.
     Block temporarily: Block messages from the sender temporarily and allow the upstream MTA to try again after the block duration ends.
   • Block duration: The length of time that IMSVA will block messages from the sender.
5. Click Save.