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How should we know that? You don't give us a single clue what you want to achieve with Linux.
I would recommend to go to Distrowatch and give the first ten of the list a try, if you search something for everyday use.
But without knowing your intentions and your hardware this is just a shot in the dark.
Can you explain why you want OP to install Ubuntu? For something like a mail server which plays a critical role in business. CentOS is an acceptable choice but Ubuntu would not be a smart choice. Go with Ubuntu server if you like. Debian and Slackware are other very stable server distributions that you can look into. I have used Qmail on CentOS 5 and was happy with the way things turned out. But remember that all those distributions are community editions and you will not have paid support from the community and if you are planning a mission critical mail server, you can opt for RHEL or SLES where you get paid support which is indeed helpful when you can observe down times.