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forward from Gsuite to M365 doesn't work

Gabriele Cafaro 0 Reputation points
2025-06-26T16:55:38.3533333+00:00

Hi, i'm migrating my organization frmo Gsuite to M365.
Since it is a phased migration i still have Mx record pointing at google MTA. users already in O365 have a. forwarding rule withing Google.
point is: this rule sometimes just doesn't work i se "interrupt" in the log but no reason and no further actions. other times it works: even in the same email, that gets delivered in some Exchange mailbox bot other users (migrated) have "interrrupt" in the log.
any clue?

Exchange | Hybrid management
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  1. Jade-T 3,520 Reputation points Microsoft External Staff Moderator
    2025-06-27T04:34:30.6466667+00:00

    Hi @Gabriele Cafaro

    Thank you so much for sharing the details of your situation. I can absolutely imagine how frustrating it is when email forwarding sometimes works perfectly and then suddenly stops, especially during a big project like a G Suite to Microsoft 365 migration. Migrations are already complex, so unpredictable issues like those "interrupt" entries in your logs with no clear explanation definitely make things harder. 

    From what you've described, this kind of issue really needs a deeper look on the backend, beyond what we can resolve here directly. 

    To get the right support, I highly recommend that your Microsoft 365 administrator raise a support ticket through the Microsoft 365 Admin Center. This is the best way to get our technical specialists to take a closer look with the right tools and help resolve this for you. 

    Please have your Microsoft 365 admin follow these steps: 

    • Sign in at https://admin.microsoft.com 
    • In the left menu, go to Support > Help & support 
    • Click Contact support, then briefly describe the issue (e.g., “Forwarding rule fails intermittently – message trace shows 'interrupt'”). 

    To help Microsoft's support team get a head start, please try to include as much of the following info as you can when you submit your ticket:

    • Message trace logs from Microsoft 365 (showing both successful and failed deliveries) 
    • Any relevant log entries from Gmail 
    • A brief explanation of how the forwarding rule is set up 

    These details give our support engineers the context they need to troubleshoot more effectively. They will keep the ticket updated with progress so you can track everything clearly. 

    I’m sorry I can’t provide a direct fix from here, but I’m happy to assist you in preparing the support request or if you have any other questions. Just let me know, I’m here to help. Wishing you a smooth migration and thank you again for your patience.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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