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Postfix:How to redirect to another mail server an email from from a sender

Last Modified: 2015-06-26
Have Postfix 2.6.6 on RedHat  which is used as an internal mail relay server for all incoming emails to be relayed to our exchange server. We are relaying emails destined to our domain ( mydomain.com ) to our exchange mail server ( ). This is done by /etc/postfix/transport containing "mydomain.com smtp:[10.10.01] ".
We also want to relay emails from a single email sender "sender@otherdomain"  to our exchange server at How can we do this?
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