Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Staged migration O365, mail bouncing back for non-migrated users 550 5.7.1

Posted on 2014-09-09
3
Medium Priority
?
557 Views
Last Modified: 2014-09-15
Hi,

I am currently in the middle of a staged migration, and I am facing a strange issue : some mails are bounced back with an NDR code 550 5.7.1 : Message rejected due to content restrictions. What I don't understand is that it the generating server is an Outlook online server, but it only affects non-migrated users (even when both the sender and recipients are non-migrated) :

"Received: from DM2PR0501MB1327.namprd05.prod.outlook.com (25.160.130.156) by
 DM2PR0501MB1326.namprd05.prod.outlook.com (25.160.130.155) with Microsoft
 SMTP Server (TLS) id 15.0.1024.12; Mon, 8 Sep 2014 19:03:09 +0000
Received: from DM2PR0501MB1327.namprd05.prod.outlook.com ([25.160.130.156]) by
 DM2PR0501MB1327.namprd05.prod.outlook.com ([25.160.130.156]) with mapi id"

The MX records are still pointing to my On-Premise exchange, and I didn't make any change into the default behavior of the anti-spam policies in O365. Any idea on why mails between non migrated users are filtered by Exchange Online ?

Thank you !
0
Comment
Question by:maxalarie
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 43

Expert Comment

by:Vasil Michev (MVP)
ID: 40313101
Sorry, can you provide a bit more details? What do you mean it's affecting only non-migrated users, why are messages sent between non-migrated users reaching O365 in the first place? Are you using EOP as the filtering platform only, without using Exchange Online (yet)?

"Message rejected due to content restrictions" definitely looks like something is wrong with the EOP settings, are you certain they are the default ones? You can create a new one specific for the domain in question if needed. You can also create an 'allow' rule and/or add your IPs to the IP allow list.
0
 
LVL 2

Author Comment

by:maxalarie
ID: 40315162
Hi Vasil,

Thanks for answering. Why messages sent between non-migrated users are reaching O365 is what I'm trying to figure out actually.  I did not configure at all EOP to use it as a filtering platform, which puzzle me even more. I will try you suggestion to  allow affected domains.

Thank you !
0
 
LVL 43

Accepted Solution

by:
Vasil Michev (MVP) earned 2000 total points
ID: 40315379
Make sure to check the targetaddress attribute on the affected mailboxes, it might explain the funny mailflow (it's what the staged migration wizard would change to make sure the migrated users continue to receive mail).
0

Featured Post

Is Your AD Toolbox Looking More Like a Toybox?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

New style of hardware planning for Microsoft Exchange server.
The core idea of this article is to make you acquainted with the best way in which you can export Exchange mailbox to PST format.
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…
Suggested Courses

715 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question