I have a domain which is receiving lots of junk mail; perhaps "backscatter" from some spamming. I thought I'd share my experience dealing with it.
This was seriously hammering my server:
top - 02:09:37 up 60 days, 10:11, 1 user, load average: 22.36, 85.27, 83.81
Tasks: 197 total, 2...