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Associating an outgoing IP address with an authorized user

ne flag

I have a task to implement sending messages by authorized users through some of their IP addresses. In other words:

         +-------------+
user1 -> |outgoing IP 1|
user2 -> |outgoing IP 2| -> 
user3 -> |outgoing IP 3|
         +-------------+

(one user - one IP)

In this scheme, incoming IP of a mail server can be the same for all users, only outgoing IP matters.

Now I am running a separate instance of sendmail for each user on a specific IP on one server. This is not very handy. Is there any software (sendmail, Postfix, etc) that can create such a mapping?

Thanks for any hint!

mangohost

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