On 02/14/2013 12:23 AM, Patrick wrote:

    > I have a customer who would like to configure the Postfix server
    he uses
    > such that certain users can only send to local users.


Use a restriction class that implements this; examples are included here:

    http://www.postfix.org/RESTRICTION_CLASS_README.html


    I'm wondering if
    > there are any built-in facilities for restricting which delivery
    agents can
    > be used by particular users?


Delivery agents deliver queued mail. The decision to accept the mail for a particular destination has already been made at that point.

--
J.

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