At my company we're doing almost the exact same thing.
FOr this we use Postfix on RHEL5 with MySQL for domains, users and aliases.
With about ~10k accounts everything works great except the forwarding vs SPF 
problem, ie:

1. someu...@hotmail.com sends a message to i...@yourcustomer.com
2. your server forwards this message to yourcusto...@hotmail.com
3. hotmail rejects the message because your server is not allowed send messages 
from someu...@hotmail.com

I believe the solution to this would be SRS, but haven't found any such 
solution for Postfix yet :(
http://www.openspf.org/SRS

Martin

On Fri, 15 May 2009 02:53:19 +0200, Scott Haneda <talkli...@newgeo.com> wrote:

> A client of mine has a web service where a simple web page can be made
> via a browser to crete an identity for them online. Build a page with
> web tools, toggle a setting to add DNS records, update the registrar
> to point to the NS's, and they have a live webpage in short order.
>
> They want to be able to allow an info@ email address that will only
> forward to some other account.  There is no need for pop/imap login, 
> i...@example.com
>   will simply forward to users-des...@theiremail.com
>
> Any suggestions on the simplest way to approach this.  I was thinking
> postfix with MySql backed data store.  Today I read that RHEL is
> behind on postfix, and I think does not have MySql support in their
> rpm's.  I have zero access to a staging server.
>
> If this turns into a high volume site, would file based aliases fall
> apart after a certain amount?  I also see maintaining a alias mapping
> via a file managed by a web service to be prone to error.  If anything
> I wold store the mappings in a database, and write them out clean on
> schedule.  What are the upper limits of how many forwards I should
> feel comfortable maintaing as a local file?
>
> Any other suggestions on methodology?

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