HELP! Google Attacking Port 25

[KrazyBob]

Google's subnet of 209.85.0.0 is pounding port 25 on a new 9.3 server sending hundreds of messages per minute to the server admin's address addresses as postmaster@servername.net The emails are dated December 31, 1969 04:00PM. There are 1300 messages in the time it took to type this. I am deleting them wit qmHandle but even with the IP blocked the server is loading up.

I have blocked Google's subnet in our firewall, but this is obviously a problem and one I am unfamiliar with.