Hi All,
I would like to know the best and free linux mail
server which is highly scalable. The traffic could be
around 1000 user accounts and around 200 users
accessing simutaneously.
My vote will go to Courier every time. Its architecture and configuration is similar to Qmail, but it provides a full mail suite (SMTP, POP3, IMAP, webmail, fax, mail filtering) which can be used as a whole or just the parts you like.
If you run most any other modern SMTP server (such as Postfix), you'll probably use Courier's IMAP server with it. Give the suite a try. It's easier (IMO) to configure everything once, than to do it once for each piece of your mail server.
I use the Courier system in my work environment, supporting about 1000 users. Our system uses an NFS backend and a cluster of identical mail servers. Each of the three mail server is an 800Mhz P3 with 512MB of RAM. Each one runs the Courier suite, plus SpamAssassin and RAV antivirus. The system is designed to scale linearly; if the load becomes too great, we just add another server and rsync the filesystem of an existing server onto the new one.
Let me know if you're interested in more details.
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