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If you do a web search for something like "setting up enterprise mail using postfix" (or using sendmail or using ...) you'll get various hits.
Better yet would be to go a bit more generic to see other things you might want (such as a spam filter like spamassasain or a virus scanner like clamav). One such link would be: http://flurdy.com/docs/postfix/
Note that link shows Ubuntu and Postfix but it doesn't have to be either - it is just an example of what could be done.
I've yet to find a "replacement" for Exchange if your users are used to it.
Exchange when coupled with the web client or Outlook provides a nicely integrated e-mail/calendar/task/notes/contacts environment that pretty much has to be built from different linux equivalents.
Decide on your requirement, it may be that Exchange is actually your best option (I'm now ducking the inevitable flame-war from linux/open-source die-hards!)
I was recently the techincal lead on a project to examine our office mail/calendar/contacts options, we evaluated several options and our criteria was ease of "access anywhere" and on multiple mobile devices, so we actually ended up out-sourcing to Google Apps.
Last edited by TenTenths; 08-22-2013 at 11:45 AM.
Reason: mi spellink sux
Since the users don't use "Exchange" the comments about ease of use are a bit off. Environments that have Exchange "servers" typically have "Outlook" clients. Or they use the web interface and bypass a locally installed client altogether.
Don't confuse client with server. You can often pick and choose which you use. (At a prior job we had Lotus Notes server and choice of clients - many of us used Eudora at the time as the client.)