Moron ratware

[Kenneth Porter]

I've been getting the same bad RCPT TO from 200.232.195.50 for the last 13 
hours. I can see the same sendmail process in /var/log/maillog for that 
amount of time, with "last message repeated xxx times" a lot. I tcpdump'd 
the connection and see the RCPT TO and rejection over and over. (System is 
Fedora Core 2.) What's the right thing to do about it? I hate to kill the 
connection just to have this guy go fill someone else's logs.