This is part of a mail that I received
The IP 184.108.40.206 is attacking our server at 220.127.116.11 and 18.104.22.168.80 with UDP flood.
I have a newsletter scripts that I use to send newsletter to a lot of emails on my site (with IP 22.214.171.124). The email database that I have has a lot of mails that are not active but I still send to all of them. Could this be the possible cause of the UDP flood?
What are the other possible causes?