Why I could be marked as spam or phishing email?


Most probably because your message did not pass the DMARC Authentication
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Users in a hybrid deployment can’t access a shared mailbox that was created in Exchange Online [Resolved]

Users in a hybrid deployment can’t access a shared mailbox that was created in Exchange Online [Resolved]

  • Date: 24/04/2018 10 minutes to read

    Applies to: Exchange Online, Exchange Server 2016, Enterprise Edition, Exchange Server 2016, Standard Edition, Exchange Server 2013 Enterprise Exchange


These issues can occur when the shared mailbox is created by using the Exchange Online management tools. In this situation, the on-premises Exchange environment has no object to reference for the shared mailbox. Therefore, all queries for that SMTP address fail.
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shared mailbox Auto-mapping isn’t appearing for online users


This is a very well know issue or you can say not well known for most of the admins

The issue is the auto mapping option

This option

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On-premises user isn’t receiving emails from online user

On-premises user isn’t receiving emails from online user


First we must move the user to un synced OU

The log in the the server which have the Azure AD sync tool

And open the windows azure active directory tool

Now that we have moved the user in a unsynchronized OU and that it’s appearing in the “Deleted users” section, you have to forcefully delete the user so you won’t have to wait for 30 days:

Run the following command

In the azure power shell

Start-ADSyncSyncCycle -PolicyType Delta

Then open the PowerShell and connect to the online exchange

Use the following command

Import-Module MSOnline

$O365Cred = Get-Credential

$O365Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection

Import-PSSession $O365Session

Connect-MsolService -Credential $O365Cred

Then run the following to get the object ID

Get-MsolUser -ReturnDeletedUsers | FL -Property ObjectId,displayname

We must get the user objectID

Remove-MsolUser -ObjectId 080535c0-061a-4b0e-a6fe-48ed7fc9159d -RemoveFromRecycleBin -Force    

Note: make sure you enter the correct ObjectId

After deleting the user, you will have to make sure his cloud mailbox is also deleted using one of the following cmdlets:

Get-Mailbox -Identity “username@domain.com | Remove-Mailbox -PermantentlyDelete $true

Get-Mailbox -SoftDeletedMailbox “ username@domain.com ” | Remove-Mailbox -PermantentlyDelete $true

Now do another delta sync in the azure AD server

Start-ADSyncSyncCycle -PolicyType Delta

After the cloud user and cloud mailbox are completely removed from the tenant, move the user from your local AD back into the synchronized OU, do a Delta Sync and then wait for the user to appear again in the Office 365 cloud, under Active users. Do not assign a license to the user.

Now move him back to the synced OU

And run the command

Start-ADSyncSyncCycle -PolicyType Delta