This is part of a mail that I received
The IP 220.127.116.11 is attacking our server at 18.104.22.168 and 22.214.171.124.80 with UDP flood.
I have a newsletter scripts that I use to send newsletter to a lot of emails on my site (with IP 126.96.36.199). 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?