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We have an on premises mail server (not exchange) and we have been evaluating Office 365 for a while and really like it.

As a migration path, and to work out any kinks, is it possible to have our current mail server hosting the majority of our users, while we slowly migrate some users (like our technical staff) to Office 365?

Will MX records allow for Office 365 to be queried for the user first, and then if not found, tries the next mail server on the list (our on premises server)?

Thanks!

Brian
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1 Answers1

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It depends on your mail server.

The way Exchange does this is by configuring its SMTP domain(s) as "internal relay", which basically means "try to find the recipient in this system and if it's not found route the message somewhere else", while instead the standard configuration of an "authoritative" domain is "try to find the recipient in this system and if it's not found reject the message".

Some mail servers other than Exchange can be configured this way (I did it personally with MDaemon), so yes, it might be possible, depending on which mail server you're using.

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Massimo
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