question

Tebo-1566 avatar image
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Tebo-1566 asked AndyDavid commented

Ability to send email internally when Exchange online is not avaialble

Scenario
Using the Exchange hybrid setup and with most email boxes in the cloud. At some point internet connection might be down, or online exchange services not avaialble. Internal processes heavily utilising email.
Question
Is there a plan by Microsoft to allow the on-premise server to send email internally using the onpremise server whilst exchange online is ot available, Then when it comes back online everything switches back to using exchange online and emails that we created internally replicated to exchange online.

The reasoning is that there are so many notifications generated internally coming through email, and the unavailability of Exchange online for what ever reason hiders internal processes that use workflows which in tern use email.



office-exchange-hybrid-itpro
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Yes, that would work and you wouldnt have to send to both on-prem and 365.
Note however, that you will need to monitor the mailbox sizes for the on-prem mailboxes during any outage as they would not be able to forward during that time

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KyleXu-MSFT avatar image
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KyleXu-MSFT answered AndyDavid commented

@Tebo-1566

If your mailbox hosted on Exchange on-premises, you will could keep sending email internally when cannot connect to Internet(Communicate with Exchange online).

If your mailbox hosted on Exchange online, you will cannot use this mailbox when cannot connect to Internet. There doesn't exist workaround for that.

Microsoft could make sure the stability of Exchange online, you don't need to worry about it. Just ensure the network stability in your organization.

You can also try to create two mailboxes, one in Exchange on-premises and another on Exchange online, then sent notifications to both of them. In this way, if your organization has network problems which caused cannot connect to Exchange online, the Exchange on-premises mailbox still could receive notifications email.


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Thank you so much. I think creating two mailboxes one online and the other on premise could work. This will ensure that key processes using email continue functioning when access to exchange online is not possible.

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That also means you would have to modify all the internal processes to send to the on-prem mailboxes during any outage then set them back afterwards. Is that really practical?

Any messages sent during that time wont be replicated to the 365 mailboxes.

If you dont make any changes, those messages should simply queue during an Exchange Online outage then get delivered to the Exchange Online malboxes once the connection is restored.


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AndyDavid avatar image
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AndyDavid answered Tebo-1566 commented

You would have to make any changes like that manually. There is no plan or ability by Microsoft to do this automatically.

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The mailboxes would be in the cloud and so there will be no way to access them. I presume the manual intervention would be to move the mailboxes to the on-premise so that emails can flow internally, but as there is no access to the cloud then this will not be possible. Unless I am missing something. Is there any other way one can do these manual changes without access to Exchange online to be able to send email internally. That is to say, what manual changes would need to be done to make it work.

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Not really sure what you are asking for, but I responded to this

"is there a plan by Microsoft to allow the on-premise server to send email internally using the onpremise server whilst exchange online is ot available, Then when it comes back online everything switches back to using exchange online and emails that we created internally replicated to exchange online."

There is nothing that allows for this other than you manually changing mail flow manually and creating new mailboxes if that was even needed.

IN other words, if you created or used existing on-prem mailboxes during an outage, you could certainly send mail between them. That would work automatically.
Nothing would be replicated to EXo once it was back online however.


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What if the notifications are sent to the on-premise account and then do mail forwarding to the cloud account. Will that not get the forwarded mail to queue until the exchange online is available at which time the email will be delivered to the online mailbox

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