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When someone will send email to wrong distribution group you can easly delete this email using Search-Mailbox CMDlet.
All you need it’s to get distribution group members and run for each of them search-mailbox.
Below you can find example how to remove email sent to distribution group Important_DL with subject Confidential Report.
Get-DistributiongroupMember Important_DL | Search-Mailbox -SearchQuery subject:"Confidential Report" -DeleteContent -Force:$TRUE
Above command will delete email with subject Confidential Report from users mailboxes which are members of Important_DL distribution group.
You can also use others attribute to define email properties to delete.
Below you can find more properties which you can use:
|To||to:”ben Smith” “to:bsmithto:email@example.com”|
To remove email sent with subject “Report” with attachment report.zip you can use:
Get-DistributiongroupMember Important_DL | Search-Mailbox -SearchQuery 'attachment:"report.zip" and subject:Report' -DeleteContent -Force:$TRUE