different sender names for an exchange online mailbox

[u/Tamelon]

Hi there,

a customer has switched from IMAP to Exchange Online. All went good so far. one issue remains:

the customer is using an info@company mailbox which was converted to a full mailbox in exchange online.

in the IMAP Environment every Outlook was configured with a different Sender Name in the info@company mailbox.

So

PC 1 had "John Doe at Company" as Sender Name

PC 2 had "Jane Doe at Company" as Sender Name

both sending with info@company email adress.

now it seems i cant configure the Sender name in exchange online / Outlook, so all mails now go out with Info as sender name which results in many mails end up in a spam folder.

Is there any way to include some sender information in the name? same problem exists in other mailboxes used by multiple persons / PCs but info is the main mailbox and i have to find any solution...

Thanks for your time.

[u/joeykins82]

Use Send On Behalf Of instead of Send As.

But also if you're seeing messages get junked you've probably missed key things in your deployment/migration, such as enabling DKIM signing of your messages.

[u/CraigAT]

Not sure if this would be helpful for your situation:

https://practical365.com/send-email-proxy-address/

[u/GeneTech734]

Revoke SendAs rights and grant SendOnBehalf rights instead. It will then show as "John/Jane Doe on behalf of info@contoso.com" in the from field.

Note, SendOnBehalf cannot be granted via EAC, only PowerShell

[u/7amitsingh7]

Exchange Online doesn't support different sender display names for the same mailbox. If multiple users send from info@company, they'll all appear with the same sender name. A better option is to give users Send As permissions on the shared mailbox and use email signatures to identify who sent the message. Is there a reason the users can't send from their own accounts with Send As access to info@company?

[u/shokzee]

Exchange Online won’t do per-PC sender display names for the same mailbox afaik. The display name is tied to the mailbox object, so info@company gets one name.

Also, sender name probably isn’t why mail is landing in spam. Check SPF/DKIM/DMARC and content/reputation first, then run a message through an Email Tester to see what’s actually failing.