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The client is the commissioner of a newsletter or another mailing. In the easiest case this client is the same one as the client in which your newsletter is sent. (You always see your delivery client on the top right side of your user interface.) But there can also be more complex connections. In this case an additional client is needed.
Different clients come into play in these cases:
One case is when you send out several newsletters that you want to manage separately. Reasons for this may be:
In this case, you can set up different customers – different departments of your company, for example – as principals under Account > Client Management via the button Create new client.
Use different clients when you send out newsletters for different customers and want to manage them separately. In this case, you can set up your customers as clients in the Account section in the same way as in the case above.