reject mails unknown users at smtp stage (postfix &relay_recipient_maps)

[Drew Marshall]

On 7 Feb 2007, at 21:09, Peter Russell wrote:

> Any have any thoughts on performance difference between the method  
> suggested by Drew Vs a local hashed recipient map?
>
> I am concerned about the quality of the network connection from my  
> GW to the Exchange - Exchange is unreachable is mail rejected or  
> deferred?

It will be rejected with a 421 (I think from memory) error as being  
unable to look up against the ldap database. Personally, I prefer a  
local database so I have the mail even when the Microsoft kit fails.  
Performance wise you won't notice much difference unless you Exchange  
server is on the end of a 56k modem or possible on a high latency  
satellite link

Drew

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