I think you should use LDAP if you have a large number of user and most of 
your operations are search and read operations. You can store your users 
info in this LDAP and use it for authentication (that can be specified in 
your protal).

According to the free email accounts you want to offer try to integrate 
webmail as part of your protal users desktop, you can use the same 
authentication info to authenticate automatically to the mail server after 
logging to the portal desktop (Single Sign On): which means that you will 
have a part of your desktop containing your mailbox.

Good Luck

On Thu, 3 Jan 2002, Ben Ocean wrote:

>Hi;
>I'm going to be building a robust, complex Web portal that, among other
>things, may offer free email accounts. These POP3 accounts would run
>through qmail and authenticate through OpenLDAP (and Kerberos V behind all
>that). I currently don't host my own DNS, although if I offer the free
>email accounts, I'm sure I will have to do that. I've installed all the
>requisite tools on my server to develop this portal. I'm currently
>schematizing the architecture and am vitally concerned about how POP3 email
>accounts would be integrated. Would someone please offer a few sentences of
>advice on this topic and a resource or two to consult? Again, the
>architecture will integrate qmail, OpenLDAP and DNS.
>TIA,
>BenO




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