Gsuite Migration Email forwarding issue

Question

Gsuite Migration Email forwarding issue

Sabarish Natarajan 456

Hi All,

I am performing Gsuite migration using the Gsuite migration option in Office 365. Currently I am facing 2 issues here.

Issue 1: Migration is happening in good rate and the migration batch reaches the synced state. Whereas once i give "Approve the Migration Batch" & "Complete the Migration Batch" after an hour the batch status changes to "Completed with Error" but the batch details shows few mailboxes are completed and few as Synced. For one of such batch it got resolved by itself in few hours, will the same happen to other batches or any troubleshooting steps needs to be performed ?

Issue 2: Migration is initiated for all users in batches segregates based on the mailbox size. So as soon as the Batch with less mailbox size status changed to synced, i complete them. Now when these migrated users send emails to Non-migration users (Migration in-progress) the email is not getting delivered to Gsuite. I have created the Alias Domain in Gsuite and the MX for the Alias domain points to Gsuite. I can also see the secondary alias for all these users in Gsuite with this alias domain. When i send email from external sender to the alias domain, it reaches the Gsuite mailbox without any issue, but email sent from same Office 365 tenant is not getting delivered.

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Answer 1

Lucas Liu-MSFT 6,191

Hi @Sabarish Natarajan ,
About issue1:
According to my research, these errors are usually transitory, if you continue to migrate, it will repair itself. According to your situation, please test whether the mailbox can work normally after the migration is completed. If the migration is successfully completed and the mailbox can work normally, then I think you don't need to worry about this issue.

About issue2:

Can emails sent from the migrated user mailboxes to other external users be successfully sent? Or send it to other users who have already migrated. Just want to make sure that it will fail if only sent to users who have not migrated.
Did you received the NDR after send email to users who have not migrated failed?
Please check the message trace and see if there have any related information.
After create a sub-domain for mail routing to your Google Workspace domain, it may take up to 24 hours for Google to propagate setting to all of the users in your organization. And if you are using non-default transport settings in your Microsoft 365 organization, Workspace. Be sure that either your default Remote Domain ("*") has Automatic Forwarding enabled, or that there is a new Remote Domain for your Google Workspace routing domain (e.g. "gsuite.fabrikaminc.net") that has Automatic Forwarding enabled.
For more information you could refer to: Perform a Google Workspace (formerly G Suite) migration, it also includes some restrictions on migration.

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Sabarish Natarajan 456 Reputation points

2021-01-26T14:39:21.63+00:00
Hi @Lucas Liu-MSFT ,

For Issue 1, users are not facing issue with the mailbox post migration completion. But it is taking too much of time, the batch i completed by yesterday noon is still not completed.
For Issue 2:

Users can send email to external IDs & migrated IDs as well.

No NDR

I couldn't see any option to enable Auto-forwarding for the subdomain. Where as i have enabled the same in outbound spam rule.

In message trace email sent to the primary SMTP address status is showing as resolved and then the same email is sent to sub domain (gsuite.domain.com) which status is showing as "Getting Status".
I noticed that the forwarding SMTP address is added to the mailboxes but the emails are not getting forwarded. DeliverToMailboxAndForward is set to False.
Sabarish Natarajan 456 Reputation points

2021-01-26T14:39:35.747+00:00

Now the emails sent from Migrated mailbox to non-migrated mailbox are delivered to its Office 365 mailbox. I tried sending email directly to ******@gsuite.domain.com from migrated mailbox it is also delivering to Office 365 mailbox and not getting forwarded to Gsuite.

When i try to send email to ******@gsuite.domain.com from external account it is getting delivered successfully.
Lucas Liu-MSFT 6,191 Reputation points

2021-01-28T10:36:57.347+00:00
Hi @Sabarish Natarajan ,
For issue1:
Please try to run the following command to retry failures within a “Completed with errors” migration batch.

Start-MigrationBatch -Identity <>

For more information: Start-MigrationBatch

For issue 2:
According to my research and study similar cases, what is the email address of Office 365 where you received the email? If the recipient's email address is associated with an email address in the Office 365 domain in Exchange online, the email will not resolve the external MX record, and will directly send the email as an internal recipient to mailbox on Office 365.

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Sabarish Natarajan 456 Reputation points

2021-01-28T11:28:38.43+00:00

@Lucas Liu-MSFT
Issue 1: MS Support team have confirmed that the issue is with the Throttling limit which needs to be increased by Gsuite team. Contacting them for the same.

Issue 2: Yes that was the mistake i made. Unfortunately user mailboxes have secondary alias with the alias domain, due to which the mail was delivering to O365 mailbox.

Thanks for the response
Lucas Liu-MSFT 6,191 Reputation points

2021-01-29T09:51:55.413+00:00

Hi @Sabarish Natarajan ,
I’m glad to hear that you have found the reason for the slow migration.
Do suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.

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Sabarish Natarajan 456 Reputation points

2021-01-29T10:01:11.197+00:00

@Lucas Liu-MSFT : unfortunately google team isn't accepting the request to increase the throttling limit. Not sure what else can be done
Lucas Liu-MSFT 6,191 Reputation points

2021-02-02T08:24:51.907+00:00

Hi @Sabarish Natarajan ,
As you know, the maximum rate of migration is affected by the "Throttling limit". If Google cannot provide a larger Throttling limit, then we cannot speed up the mailbox migration.
If you find that the migration status shows "Completed with Error", you can try to retry the migration quickly by running the above command line.

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Sabarish Natarajan 456 Reputation points

2021-02-02T08:45:50.757+00:00

Hi @Lucas Liu-MSFT : Actually the issue isn't with slow migration it is with slow completion. 60gb of mailboxes takes 6 days to get into synced state, now if we give migration completion it takes another 3-4 days. At synced state i can see 95% of the data got completed and the mailbox size is also nearly matching.
Lucas Liu-MSFT 6,191 Reputation points

2021-02-03T05:45:01.63+00:00

Hi @Sabarish Natarajan ,
There are many factors that affect the migration speed, such as data source, mailbox size and network conditions, etc. The “Synced” status means that the migration batch has completed an initial sync of the data. Consider the size of your mailbox and according to Microsoft's official article: “Gmail limits how much data can be extracted during a specific period of time.”. Moreover, according to Microsoft's official estimate of the time required to migrate 60GB mailbox, it will take a long time.
For more information: Performance for migration methods

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Lucas Liu-MSFT 6,191 Reputation points

2021-02-05T09:33:34.077+00:00

Hi @Sabarish Natarajan ,
It's long time no receive your feedback.
I am writing here to confirm with you how thing going now?

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Gsuite Migration Email forwarding issue

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