New exchange address type SPO

Care to share a screenshot? I'm not seeing this.

here it is....

Thanks for sharing, let me ask around :)

It seems like these addresses are added to mailboxes that are involved in SharePoint Online/OneDrive for Business sharing. SharePoint Online has recently started to use Exchange Web Services for its notifications, so it's possibly related to that.

I've recently discovered these as well. Unfortunately, they are user-visible entries as well as that show up in the GAL and I would prefer they be hidden. Interested to hear a response on this.

Hi Talyllyn,

Sorry for the late reply.

The SPO type email address indicates that it is related to SharePoint Online features.

The fact is that it only appears on objects with a SharePoint Online license confirms this.

Currently, there is no official documentation shows that describes the function of this new type email addresses.

We appreciate your understanding.

Best Regards,
Lance

@Tony

Thanks for your sharing.

However, I have done some tests on my lab, this type addresses should not be related to the sharing.

We appreciate your effort on the issue.

Best Regards,
Lance

Sorry, but I think you're wrong. First, the use of the SPO proxy address is documented: support.microsoft.com/.../3134824.

Second, its use is related to sharing because many of the notifications send on behalf of SPO users are because they share documents with other users. SPO needs to generate email on their behalf and uses Exchange Web Services for this purpose to impersonate the user so that the messages are not bounced as junk mail. The logic behind having a separate address is that it is far less likely that any maintenance process that might go near regular SMTP addresses would ever want to mess with these ones, so they remain under the control of SPO as a way to link the user's Exchange Online mailbox with their SPO activity. QED.

Hi Lance,

Thanks for looking in to this.

It would be nice if MS could warn us about this sort of thing or at least have some documentation available before it happens.

Amanda (Talyllyn)

Tony is correct, as usual, I just wish we had some more details published in the article. For example, in case you are wondering, the address format is generated based on the GUID of the user's MySite followed by the @ sign and the Tenant GUID. Getting the GUIDs is a bit of a pain though, as they're not exposed in the UI.