Jorn Argelo wrote:
> Thanks for your reply. LDAP, however, is not really an option because of the
> amount of emails we get. You see, the postmap hash db is an extract of the 
> email
> addresses defined in Active Directory. If we have to query AD for every email 
> we
> get, we will probably slow things down / cause a lot of load on the domain
> controller (I think we're at around 65.000 emails / day ). This is why we made
> the choice to make an hash db based solution rather then an LDAP solution. 
> This
> is faster and produces a lot less load.
>   

It probably will be marginally faster, but 65,000 lookups per day isn't 
that much.  If you assume that the majority of that mail comes in during 
8 hours, you're talking about two lookups per second.  An LDAP server 
should be able to handle thousands of lookups per second.  The cost 
shouldn't be significant, and it'll simplify your mail server 
configuration considerably.  (I'd imagine that using Courier's MTA 
would, too)

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