Office 365 - Catchall Mailbox - HELP

Hi Experts,

I have followed this article:

For some strange reason, it seems to send emails to the catchall mailbox even though the email address is being sent exists within the catchall mail group.

So for instance we have an email called This address contains all users.
We have another group called - This contains all groups, such as all@ which contains all the users and distribution groups too.

So I have a rule that states:

Except if...
Is sent to a member of group ''
or Is received from 'Inside the organization'

So that there is no way it can go into the catchall mailbox if sent within the organisation. Again for some strange reason this is still occurring, however users are receiving the email too but additionally the catchall mailbox is getting too.

Any ideas on this? No point raising a ticket with Microsoft as they clearly mentioned to me that they do not support this functionality.

Thanks in advance.

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I think you are mixing things and confusing what your setup is. is a distribution group?
What about

It seems unclear what your setup is.  Presumably you followed the info in the link along with the distinctions.

What if any rules do you have dealing with mail handling?
Check mail trace, the issue could mean that there are multiple recipients to the email with one having a typo. Note because you can only See recipients in the To and the Cc field it does not mean there are no Bcc recipients of this message.
A mistyped Bcc recipient will be routed to your catch all.
Search your mail flow based on sender, and see if there is a reference to a non-existent email address that is rerouted.
Vasil Michev (MVP)Commented:
It's really NOT recommended to use catch-all, but if you insist, you can follow the steps here:
introluxAuthor Commented:
Vasil - I have posted the same link on my initial post and its not working.

Arnold - I have checked through odd emails of leavers or incorrect accounts and nothing out of the ordinary.

Any further help will be appreciated.



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introluxAuthor Commented:
Microsoft support went through some minor changes that required to be done via a remote session.
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