How to organize in zimbra 8 protection against spam and multithreading of messages from one IP?

Question

Zimbra

Good day to everyone,
tell me how to protect yourself from spam and a large number of incoming messages from the 1st IP
. When testing, I sent 50 messages with an interval of 2 seconds.
After that, the server died a little, even zmconfigd fell off
access to the server via the web is unavailable
everything worked after restarting all services
zmcontrol restart
How to protect yourself under such loads
Or how to optimize Zimbra

Answer 1

https://wiki.zimbra.com/wiki/ZCS_Service_Protection