Split Domain Routing (SDR) is a term used to describe how users with email addresses in the same domain can receive emails at two different email service providers.
For example, let’s say the company domain is “my-doctors-on-call.com,” and you are moving your email from Email Service Provider X to LuxSci. You have doctors Joe and Emily, whose email addresses are firstname.lastname@example.org and email@example.com. The migration is incomplete or needs to be migrated over time, so Joe still needs to get his email at Email Service Provider X, but Emily is all moved and needs to get her email at LuxSci. This is called “Split Domain Routing.”
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