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.
There are primarily two ways:
[virtual aliase]
you can use virtual_alias_maps to redirect foo@xxxxxxxxxxx to
foo@xxxxxxxxxxxxxxxxx, provided the final server accepts such addresses.
If the final server doesn't accept these, and you use smtp to relay to,
then you can write the addresses back, using smtp_generic_maps.
[transport]
an laternative is to use use (per-user) transport_maps. something like
foo@xxxxxxxxxxx relay:[hostN.example.com]
In bothe approaches, the mappings can be generated using sql statements
(mostly CONCAT). something like
...
query = SELECT concat('relay:[', host, '.example.com]')
FROM User
where '%u' = user and '%d' = domain
you get the idea I hope.
>
> Anyone have a working example that they could share? It would be
> greatly appreciated.
>
> thanks
> -matt
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