Remote Server returned '550 5.7.520 Access denied, Your organization does not allow external forwarding

Delivery has failed to these recipients or groups:

Your message wasn't delivered because the recipient's email provider rejected it.

Remote Server returned '550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)

If you have received above error recently in an NDR, Check below settings and make changes as suggested to start the mail flow as usual. 

What caused it: Oct 2020: MC221119: Office 365 ATP External email forwarding controls and policy change

Above Policy Changes your Rules for automatic external forwarding in your Outbound Spam Filter Policy.

Which is by default set to AUTOMATIC - That blocks automatic external forwarding

• Automatic: Automatic external forwarding is blocked. Internal automatic forwarding of messages will continue to work. This is the default setting.

• On: Automatic external forwarding is allowed and not restricted.
• Off: Automatic external forwarding is disabled and will result in a non-delivery report (also known as an NDR or bounce message) to the sender.

In order to fix this issue, change your Policy from AUTOMATIC to ON. 

Changing policy setting to ON will allow Automatic External Forwarding that is been set on your Email Addresses inside your O365 Tenant.

SHAREPOINT - DELETED AND RECREATED USER DOESN’T HAVE PERMISSIONS TO SITE, ACCESS DENIED! Reused email causes SharePoint Issue

SHAREPOINT  - DELETED AND RECREATED USER DOESN’T HAVE PERMISSIONS TO SITE, ACCESS DENIED! Reused email causes SharePoint Issue

Problem

When onboarding a new employee for a customer, we ran into an issue when giving the new user access to sites in SharePoint. Assigning the license to the user and initially adding her to SharePoint went smoothly. But when it came to giving her site permissions (in the site settings), we ran into an issue.

The actual process of adding her to sites appeared to work – until you refreshed the user lists on that site. She wasn’t actually being added. We went through the process a few times, with the same result.

That’s when we noticed something funny – the new user wasn’t being added. An old user, however, WAS being added.

Root Cause 

It turns out – the old user being added was the key to figuring out what was going on.

This customer uses the first name@company for their email addresses and Office 365 aliases. The customer previously had an employee with the same name and the same email address who was no longer at the company.

When trying to add the new user, SharePoint was associating the email with the old user (who previously used on SharePoint) and pulling her in rather than the new user.

The old user had been deleted entirely from their Office 365 tenant. For some reason, despite that, the user wasn’t deleted entirely from SharePoint. When we talked to Microsoft, we were told it was a glitch in their system. Not great news, but it did mean there wasn’t anything we (or the customer) could’ve done differently while offboarding the old user.

How to Fix

This turned out to be an easy fix once the root problem was discovered. We just had to completely delete the old user from SharePoint.

To do this, we had to bring up the list of ALL users for each SharePoint site. The easiest way to get to this list is by replacing the last number In the URL for the site with zero. Once we were on that screen, we deleted the old user from each site (this had to be done individually).

Once the old user was deleted, the new user was added to the sites using the normal method.

1. Browse to the site and edit the URL by adding the following string to the end of it: /_layouts/15/people.aspx?MembershipGroupId=0

   For example, the full URL will resemble the following: https://fabrikam.sharepoint.com/_layouts/15/people.aspx/membershipGroupId=0

2. Select the person from the list, and then on the Actions menu, select Delete Users from Site Collection.

3. Now add the user again following normal process & now the new profile should get picked up. 

Above issue occurs due to mismatch in PUID - Read More

Clear browser history

SharePoint uses browser caching in several scenarios, including in the people picker. Even when a user is fully removed, he or she may still remain in the browser cache. Clearing the browser history resolves this issue. For info about doing this in Edge,

Restore SharePoint Deleted Site

Restore SharePoint Deleted Site

When you delete a user in the Microsoft 365 admin center (or when a user is removed through Active Directory synchronization), the user's OneDrive will be retained for the number of days you specify in the OneDrive admin center. (For info, see Set the default file retention for deleted OneDrive users.) The default is 30 days. During this time, shared content can still be accessed by other users. At the end of the time, the OneDrive will be in a deleted state for 93 days and can only be restored by a global or SharePoint admin.

For info about using Files Restore to restore a OneDrive to a previous point in time, see Restore your OneDrive.

For info about restoring items from the recycle bin in OneDrive, see Restore deleted files or folders.

Restore a deleted OneDrive when the deleted user no longer appears in the Microsoft 365 admin center

If the user was deleted within 30 days, you can restore the user and all their data from the Microsoft 365 admin center. To learn how, see Restore a user in Microsoft 365. If you deleted the user more than 30 days ago, the user will no longer appear in the Microsoft 365 admin center, and you'll need to use PowerShell to restore the OneDrive.

1. Download the latest SharePoint Online Management Shell.

    Note

   If you installed a previous version of the SharePoint Online Management Shell, go to Add or remove programs and uninstall "SharePoint Online Management Shell."
   On the Download Center page, select your language and then click the Download button. You'll be asked to choose between downloading a x64 and x86 .msi file. Download the x64 file if you're running the 64-bit version of Windows or the x86 file if you're running the 32-bit version. If you don't know, see Which version of Windows operating system am I running?. After the file downloads, run it and follow the steps in the Setup Wizard.

2. Connect to SharePoint as a global admin or SharePoint admin in Microsoft 365. To learn how, see Getting started with SharePoint Online Management Shell.

3. Determine if the OneDrive is available for restore

• If you know the URL of the OneDrive, run the following command:

PowerShell

Get-SPODeletedSite -Identity <URL>

A user's OneDrive URL is based on their username. For example, 
https://microsoft-my.sharepoint.com/personal/user1_contoso_com. You can find their username on the Active users (or Deleted users) page in the Microsoft 365 admin center. 

• If you don't know the URL of the deleted OneDrive, run the following command:

PowerShell

Get-SPODeletedSite -IncludeOnlyPersonalSite | FT url

• If the OneDrive appears in the results, it can be restored.

4. Restore the OneDrive to an active state:

PowerShell

Restore-SPODeletedSite -Identity <URL>

5. Assign an administrator to the OneDrive to access the needed data:

PowerShell

Set-SPOUser -Site <URL> -LoginName <UPNofDesiredAdmin> -IsSiteCollectionAdmin $True

For more info about these cmdlets, see Get-SPODeletedSite and Restore-SPODeletedSite.

Permanently delete a OneDrive

After you recover the data you need from the OneDrive, we recommend that you permanently delete the OneDrive by running the following command:

PowerShell

Remove-SPODeletedSite -Identity <URL>

 Caution

When you permanently delete a OneDrive, you will not be able to restore it

Configure email forwarding in Office 365

Configure email forwarding in Office 365

As the admin of an Office 365 organization, you might have company requirements to set up email forwarding for a user's mailbox. Email forwarding lets you forward email messages sent to a user's mailbox to another user's mailbox inside or outside of your organization.

Configure email forwarding

Before you set up email forwarding, note the following:

·         Once you set up email forwarding, only new emails sent to the from mailbox will be forwarded.

·         Email forwarding requires that the from account has a license. If you're setting up email forwarding because the user has left your organization, another option is to convert their mailbox to a shared mailbox. This way several people can access it. However, a shared mailbox cannot exceed 50GB.

You must be an Exchange administrator or Global administrator in Office 365 to do these steps. For more information, see the topic About admin roles.

Note

If you're not using the new Microsoft 365 admin center, you can turn it on by selecting the Try the new admin center toggle located at the top of the Home page.

1.      In the admin center, go to the Users > Active users page.

2.      Select the name of the user whose email you want to forward to open the properties page.

3.      On the Mail tab, select Manage email forwarding.

4.      On the email forwarding page, select Forward all emails sent to this mailbox, enter the forwarding address, and choose whether you want to keep a copy of forwarded emails. If you don't see this option, make sure a license is assigned to the user account. Select Save changes.

To forward to multiple email addresses, you can ask the user to set up a rule in Outlook to forward to the addresses. To learn more, see Use rules to automatically forward messages.

Or, in the admin center, create a distribution group, add the addresses to it, and then set up forwarding to point to the DL using the instructions in this article.

5.      Don't delete the account of the user who's email you're forwarding or remove their license! If you do, email forwarding will stop.

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