[zeveb]

Ars Technica had an article about running your own mailserver, to include IMAP, awhile back (http://arstechnica.com/information-technology/2014/02/how-to... while it's targeted at the individual user, a lot of the steps would apply to a larger, multi-server organisation. You could extend postfix with a PostgreSQL database, split the different servers onto different hosts &c.

Honestly, these days it's probably easier and cheaper to just buy Google Apps or Office365, but if you want to control your own destiny it's really not difficult.

[tzs]

The HN "detect URLs and make them clickable links" code was confused by your punctuation, resulting in garbage at the end of the URL. Here it is cleaned up:

http://arstechnica.com/information-technology/2014/02/how-to...