Email Servers are essential parts of a big corporate business.
I have setup 2 Slackware Linux v.3.5 as a mail server. Ever since I don’t care about it. After a year I tried using Red Hat 6.1 because of the newer Linux kernel. But this time, I always reboot it and found so many problems regarding it. Comparison between the two Linux I would say that Slackware performs much better than Red Hat.