Everyone's email in the company are being sent to one person

I have a user who is receiving everyone in the company's emails. Is there a way to turn that feature off? We haven't set up any rules either.
UnidineITAsked:
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MaheshArchitectCommented:
Are you saying that if user A sends email to user B it will get received by user C?
OR
What ?

There is no feature available in exchange to what is happening there unless you set some rule OR
You must be set that user as Journal recipient
UnidineITAuthor Commented:
Exactly but its more like users a-y are all sending to user z.
MaheshArchitectCommented:
if you check sent item for any other user, are you getting any entry there as CC, BCC?

If you send emails to internet from another user, still emails are getting delivered to this user?

If above is true, you must have transport rule set on exchange level which says, any email sent to anybody by anybody should deliver one copy of email to this users, can you check transport rules?

One more possibility could be:
have you set journaling on exchange database which forwards all emails to this user as journal recipient..

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Riaz Alexander AnsaryEnterprise Infrastructure Systems EngineerCommented:
Use Get-MessageTrackingLog to retrieve the log of one particular message in this case and review the report the event IDs should tell you what did happen to the message. if its expanded which means somehow it hit a distribution group or anything else you can see some other information there too. could be that one of the mailboxes has a forwarding setup to a distribution group?!?! double check your transport rules
SysToolsData Expert - Recovery,Backup,MigrationCommented:
Use Different Parameter with "Get-Message Tracking Log" Cmdlet, For all paragmeter

https://docs.microsoft.com/en-us/powershell/module/exchange/mail-flow/get-messagetrackinglog?view=exchange-ps

For Example: Get-MessageTrackingLog -Server Mailbox04 -Start "04/02/2018 09:00:00" -End "04/15/2018 17:00:00" -Sender "sam@ping.com"

Note:  This message tracking logs on the Mailbox server named Mailbox04 for information about all messages sent from April 2nd, 2018, 09:00 to April 15, 2018, 17:00 by the sender sam@ping.com.

You can also check "Message Delivery restrictions" for a mailbox to place restrictions on whether messages are delivered to individual recipients. MDR are useful to control who can send messages to users in your organization.

 https://technet.microsoft.com/en-us/library/bb397214(v=exchg.160).aspx
UnidineITAuthor Commented:
Thanks for all the responses. So the issue was there was a Transport Rule set and it was deleted pretty quickly after it was created. Somehow the rule was still in process of being applied before the deletion, thus, having all messages go to this one person's mailbox. After 2-3 hours it was finally deleted. I guess it didn't take the deletion right away and the rule still was enabled for that duration of time. But all is good now.
MaheshArchitectCommented:
I already suspected transport rule possibility in multiple comments

The only fact you are not aware that it is being created and deleted as well hence point should be awarded to experts
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