Hi, HMWP IDS detects malicious requests coming to your site and notify you about it. But all these requests might not be harmful and you need not worry as HMWP IDS will take care of this and will block the malicious requests if Impact level is more than 20 (default value specified in HMWP IDS). You can stop receiving emails regarding this by setting “Notification Threshold” option to 0 in IDS Firewall tab.
If in case valid request is also listed as intrusion then please try setting “Block Threshold” value to 30 or 40 in IDS Firewall tab. And if you do not want this feature enabled then you can disable IDS.