How to force Exchange to use a specific network card or IP for sending emails

We originally built MultiSendcon to allow Exchange to send out Emails via different smart hosts for different domains. But the product also allows sending out emails directly without any SMTP relay and allows you to select the specific local IP from which to originate the email from.

It’s a peculiar application but we now have several customers who only needed the product to have their Exchange outbound email traffic go through a specific network card and IP address instead of originating from the lowest IP address present in the system.

So if you can’t live the Exchange default behaviour of always sending out emails from the lowest IP you could just install MultiSendcon with a single non-SMTP-account configured for that.