Hi @lalajee
Are you using a mail flow rule to copy all emails to a mailbox?
If yes, in Exchange on-premises and Exchange online there is a built-in journaling feature you can use.
Exchange on-premises: Journaling in Exchange Server
Exchange online: Journaling in Exchange Online
Note that you can use a mailbox as journaling mailbox in Exchange on-premises but in Exchange online a Microsoft 365 or Office 365 mailbox can't be used as a journaling mailbox.
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