Category Archives: Office365

Exchange Microsoft Office365

Email Forwarding on an on-prem mailbox to Office 365 mailbox


 Configure email forwarding for a mailbox

Set-Mailbox -Identity “OnPrem mailbox” -ForwardingSMTPAddress “Office 365 mailbox”

Exchange Office365 Tips & tricks

MRS Proxy Error “The connection to the server could not be completed”

Check MRS endpoint user and password.

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Exchange Microsoft Office365

Remote Server returned ‘550 5.1.8 Access denied, bad outbound sender

Remote Server returned ‘550 5.1.8 Access denied, bad outbound sender’


Non-Office 365 user use this (self-service delisting portal) to remove themselves from the blocked senders list.

Office 365 user, as an admin you can unblock your blocked Office 365 email account via using Exchange admin center.

• Go to the EAC, navigate to protection > action center.
• Select the Search icon and enter the SMTP address of the blocked user.
• Click Unblock Account in the description pane.
• Click Yes to confirm the change.

For more detailed information, please refer to the article: Removing a user, domain, or IP address from a block list after sending spam email

Code Snippets Office365 PowerShell

Office 365 : Password Sync doesn’t synchronize with Azure AD Connect

Verified password sync is disabled via using PowerShell

Following cmdlets have been used to verify above and I noticed password sync was in fact disabled although I checked the option in Azure AD connect setup.

Import-Module ADSync
Get-ADSyncAADPasswordSyncConfiguration -SourceConnector <‘LOCAL DOMAIN NAME>

Enabled password sync via PowerShell

Set-ADSyncAADPasswordSyncConfiguration -SourceConnector <‘LOCAL DOMAIN NAME> -TargetConnector <‘ – AAD’> -Enable $true


thanks to:

Office 365 woes | Password Sync doesn’t synchronize with Azure AD Connect

Azure Microsoft Office365

Azure Password Sync

Check your synchronization user security tab, or in domain properties if “Replicating Directory Changes” and “Replicating Directory Changes All” is checked.

Exchange Office365 Tips & tricks

Emails between O365 and On-premises do not work

Error message: 451 4.4.0 Primary target IP address responded with: “451 5.7.3 Must issue a STARTTLS commnd first” Office 365 Hybrid

In some scenarios you might need to, in your firewall:   Disable Content Inspection with TLS


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