[ubuntu] Which ubuntu mail server

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http://ubuntuforums.org – Hi guys I run my own home webserver (LAMP + Drupal). My brother pays for his own hosting and as his site is low load/hobby site I've offered to host it for him. However he makes extensive use of the mail server facility provided by his current host. I did't install the mail server package when I setup the server. I just forward my email to my existing mailbox. I know I can install the default mail server that came on the ubuntu server CD, and I intend to try it. Just wondering everyones thoughts on alternatives. Is the bundled one the favourite or is it just there because its eas (Hardware)