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DKIM Setup with O365 and Local Exchange Hybrid

AdminAxel 0 Reputation points
2023-10-24T14:49:08.9766667+00:00

We have a hybrid environment with O365 and local exchange. O365 is used to send a majority of all OB emails and processes all IB emails and relaying. Our local Exchange server is used locally for and OB SMTP relay server that is used by our local applications/TMS to send 'bulk' emails. We are looking to setup DKIM. Since the Exchange server and O365 Exchange both send emails on behalf of the same domain what is the best practice for getting DKIM setup.

Exchange | Exchange Server | Other
Microsoft 365 and Office | Install, redeem, activate | For business | Windows
Exchange | Hybrid management

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  1. Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
    2023-10-24T17:56:54.0133333+00:00

    To leverage DKIM in 365 , then all the messages to external recipients will need to go through 365 as you prob already know.

    To set that up:

    https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dkim-configure?view=o365-worldwide

    Essentially:

    1. Configure DNS for the custom domains
    2. Enable DKIM for the custom domain(s) you send from.

    This linked doc explains it all

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