[CentOS] Large scale Postfix/Cyrus email system for 100, 000+ users

Ross S. W. Walker rwalker at medallion.com
Tue Oct 23 15:21:09 UTC 2007

Matt Shields wrote:
> I'm trying to set up a large scale email system that supports 100,000+
> IMAP accounts.  We have an existing frontend web interface that does a
> lookup on a mysql db to figure out which IMAP server to connect to for
> each user.  For the email infrastructure we have decided on Postfix
> and Cyrus.  We have configured both to use mysql to get the virtual
> user information.
> Because of the way that the infrastructure is (biz reasons) we are not
> doing shared storage, we have numerous IMAP servers that we distribute
> accounts across.  As we add more users, we image up a new IMAP server.
>  For our business's scaling purposes this was the best plan.
> What I am having a problem is how do I get postfix to transfer the
> email to the particular IMAP server that the user account is on.  I
> know that I need to use lmtp and transport, but all the examples I
> have seen show forwarding all email to 1 IMAP server.  I would like
> Postfix to do a lookup for each mailbox and determine which IMAP
> server to deliver it to.
> Anyone have a working example that they could share?  It would be
> greatly appreciated.


Then you can create a view out of your existing data schema to fit
the postfix needed schema.


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