Re: Documentation of big "mail systems"?

From: Jo Geraerts (geraerts.jo_at_skynet.be)
Date: 10/14/04

  • Next message: Frode Nordahl: "Re: Documentation of big "mail systems"?" 
    Date: Thu, 14 Oct 2004 19:39:07 +0200
To: freebsd-isp@freebsd.org

    hi,

    On Tue, Oct 12, 2004 at 11:20:51PM +0200, Stephane Bortzmeyer wrote:
    > I'm currently writing a proposal for a webmail service for, say, 50
    > 000 to 500 000 users. I'm looking for description of existing "big
    > mail" systems, using technologies like scalemail
    > (http://scalemail.sourceforge.net/), specially with an emphasis on the
    > storage subsystem for the servers (my weak point, I don't really have
    > enough experience with SAN, NAS, and so on).

    i would seriously consider a qmail-ldap system as backend. Especially the
    clustering feature is very nice. With this clustering you can simply use
    off-the-shelf hardware and balance the mailboxes over the mailstores (
    as i call them.)

    a mail may enter the cluster at any system and it will be queued on the
    right system. qmail-ldap has also a password check for courier-imap
    which redirects the imap session to the right mailstore. so it behaves
    as a single system with lots of mailstorage but you don't need pricy
    nas/san systems. Another advantage is that it scales pretty good since
    you dont have a single point ( like a nas) where everything comes
    together.

    i've a mail setup with 1 MX server, 2 mailstores and a relay server
    which servers about 130 000 people with simple commodity hardware: dual
    p3, 1 gig mem and 2 IDE harddisks. The dual processor is a little bit
    oversized but we use the same server for everything.

    if you want advanced filtering and anti-spam features, put
    postfix/exim/... in front of the qmail-ldap cluster. ( qmail-scanner is
    so not done on large systems, since it requires a perl invocation per
    connection)

    As webmail i use squirrelmail, but i think i made the wrong choice. The
    problem with this setup is that it makes a imap connection for every
    pagerequest. If I had to redesign a new webmail system, i think i would
    use something that supports persistent imap connections ( some kind of
    servlet or zope application)

    best regards,

    jo 

    -- 
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  • Next message: Frode Nordahl: "Re: Documentation of big "mail systems"?"

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