Time to check the rate limits on your mail servers

[Michael.Dillon () radianz com]

CNET reports 
http://news.com.com/Zombie+trick+expected+to+send+spam+sky-high/2100-7349_3-5560664.html?tag=cd.top
that botnets are now routing their mail traffic through the local
ISP's mail servers rather than trying their own port 25
connections. 

Do you let your customers send an unlimited number of
emails per day? Per hour? Per minute? If so, then why?

--Michael Dillon