Forum Discussion
new mail-account automatically forwards external mails to internal address
Hi,
last week I created a new mail-account to our outlook-users and added a mail-license.
Only internal mails was received in the new inbox and after troubleshooting and using mail-trace I discovered that the mails was forwarded to another internal inbox. This is not something that is configured anywhere in the mentioned settings when trying to troubleshoot forwarding-issues.
How do I turn this off, so that my new employee can receive external e-mails. We don't have any policies or rules set up, that should trigger this behavior.
Regards
Lars
2 Replies
Use Exchange Online PowerShell to check mailbox-level forwarding:
Get-Mailbox <user> | FL ForwardingAddress,ForwardingSmtpAddress,DeliverToMailboxAndForward
If either forwarding address is populated unexpectedly, remove it with:
Set-Mailbox <user> -ForwardingAddress $null -ForwardingSmtpAddress $null -DeliverToMailboxAndForward $false
Also check inbox rules with:
Get-InboxRule -Mailbox <user> -IncludeHidden
Disable or remove any unexpected forwarding or redirect rules.
If both checks are clean, review Exchange admin center under Mail flow > Rules. Also review the audit log for Set-Mailbox, New-InboxRule, or Set-InboxRule activity.
Unexpected forwarding can indicate unauthorized account activity, so if you find anything suspicious, I’d also review recent sign-ins and secure the affected account.
Hi Lars, check forwarding in three places: mailbox forwarding, inbox rules, and transport rules. In Exchange PowerShell, inspect ForwardingAddress, ForwardingSmtpAddress, and DeliverToMailboxAndForward, then check Get-InboxRule. If trace shows a rule but none is visible, it may be hidden/corrupt and need admin cleanup.
