Looking for open source email server.
I know this is not the best location for submitting this but I think the people who knows the answer can be found here.
We are in need of a decent email server (well at least good enough), for using with our application server which will be j2ee 5 compatible but all of the stuff I found are either commercial (fee per mail box) or not functional enough. The only suitable solution is zimbra which have a free version (we have small budget). Another option I found is apache JAMES, So my question is in your opinion what is the best option for us, It's not important if it's open source or not just we can't spend money for email server initially but eventually we will need to purchase support for it. Initially we think there will be between 50,000 to 100,000 mail boxes. Though extra functionalities will not hurt but main stuff we need is an email server which except common features, let us to store emails in database with support for clustering and offer acceptable UI (I think we can plug another UI, is it right?).
any help is appreciated.
Thanks.
