user verification via ldap

[peterve]

Hi,

I want to set up a postfix (or sendmail - don't know yet ) server, that is internet facing.
The server should allow incoming emails only (from the internet, to my internal mail platform), for a given number of domains, but should not allow "open relays" - for obvious reasons.

Now I want to add this functionality :
1. when an incoming email enters the postfix engine, postfix should verify if that user is a valid user by querying an ldap database, and reject if the user does not exist in the ldap database
2. when the user exists, the email should be sent (relayed) to an internal host. Because of redundancy reasons, I want to specify 2 hosts for this...

How can I solve those 2 questions ?

thanks

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[johng75]

http://www.unixwiz.net/techtips/postfix-exchange-users.html

http://www-personal.umich.edu/~malth/gaptuning/postfix/

http://www.linuxforums.org/forum/se...ring-server.html?highlight=exchange+filtering

these might help you out a lil, ive been doing some reading on the same subject and came across various sources