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hmm, not that deep into Exchange and never heard of Zimbra before, but I guess I would switch the mx to Exchange and let Exchange forward any e-mail to unknown users to Zimbra. Thus making your Exchange an internal relay server.<br />
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See <a href="https://practical365.com/exchange-server/how-to-share-an-email-domain-between-two-mail-systems/" rel="ugc">How to Share an Email Domain Between Two Mail Systems</a>
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<u><a href="https://github.com/imapsync/imapsync" rel="ugc">https://github.com/imapsync/imapsync</a></u> will likely be the tool you use.
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IT CONSULTANT

Gaston Mbey

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Hello Experts <br />
I am working on a project where the customer want to migrate from zimbra to exchange (3000 users)<br />
So there is a brand new Exchange setup that will be implemented my question is how do i setup Exchange or zimbra to coexist with the same domain because the migration will be done in batch<br />
<br />
Is it an internal relay or an external relay<br />
Any documentation about the subject?
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Hello Experts 
I am working on a project where the customer want to migrate from zimbra to exchange (3000 users)
So there is a brand new Exchange setup that will be implemented my question is how do i setup Exchange or zimbra to coexist with the same domain because the migration will be done in batch

Is it an internal relay or an external relay
Any documentation about the subject?

Migratiion from Zimbra to Exchange 2016

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.