Preserve e-mail message sent through anonymous relay Exchange 2016 hybrid

Question

Hi,

Our organization has hybrid environment with Exchange 2016 CU21 and Office 365, all mailboxes are already migrated to the cloud. One of our users has asked to check if there is a possibility to preserve e-mails messages sent through anonymous relay. Is it even possible? Maybe using shared mailbox and transport rules or something similar? I have no idea.

I would be happy for any advice or tip, thanks!

Answer 1

Hi @Tomass Pētersons

If the sender's ip address or email address can be specified, I suppose you may use setup a transport rule to preserve the messages.

The rule would be like:

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Answer 2

Sure:
Enable Journaling in Exchange Online:
https://learn.microsoft.com/en-us/exchange/security-and-compliance/journaling/configure-journaling

or set a retention policy on the recipient mailboxes:

https://learn.microsoft.com/en-us/microsoft-365/compliance/set-up-an-archive-and-deletion-policy-for-mailboxes?view=o365-worldwide

or set a hold on the recipient mailboxes:

https://learn.microsoft.com/en-us/microsoft-365/compliance/create-a-litigation-hold?view=o365-worldwide

Sounds like a journaling policy is the best fit.