A legitimate email is being blocked from a particular email address. After further investigation, you find out that the IP address is listed in IP Profiler as temporarily blocked. The time stamp of the blocked IP is almost a month ago.The temporarily blocked IP address can be found in the IMSS console (IP Profiler > Blocked List).
By default, the IP Profiler function does not automatically remove a temporarily blocked IP address. Mail clients from these blocked IP addresses will always get a 421 error.
These IP addresses have to be manually removed by the IMSS administrator. There is a hidden key that should be added to the foxdns.ini file. This will remove the blocked IP address automatically and according to the interval set by the key.
To automatically remove the blocked IP:
- Stop the IMSVA foxdns service. Run the following command:
- Go to the /opt/trend/imss/config directory and then open the foxdns.ini file.
- Add the following parameter under the [foxdns] section:
Note: The unit, #, is in minutes.
This means that the default time is 24 hours.
- Start the IMSVA foxdns service. Run the following command: