550 5.7.60: No permission to send as this sender (Microsoft 365)
You signed in as one mailbox but tried to send from a different address you don't have "Send As" rights for.
Sign-in problem Your app or device couldn't sign in to your own mail server, so the message was never sent. Fix the sign-in settings.
What the bounce message looks like
The wording changes from one provider to another. These are typical examples:
550 5.7.60 SMTP; Client does not have permissions to send as this senderCommon causes
- A printer or app signs in as one user but sends from another address, such as [email protected]
- Sending from a shared mailbox without Send As permission
How to fix it if you sent the email
- Make the From address match the account you sign in with.
- Or ask IT for Send As permission on the other address.
If you manage the receiving or sending mail system
- Grant Send As permission for that mailbox, or change the device's From address.
Free tool: paste the full bounce into the bounce message decoder to get a plain-English reading of every code in it.
Questions people ask
- What does 550 5.7.60 mean?
- You signed in as one mailbox but tried to send from a different address you don't have "Send As" rights for.
- Is 550 5.7.60 a hard or soft bounce?
- Sign-in problem. Your app or device couldn't sign in to your own mail server, so the message was never sent. Fix the sign-in settings.
- Should I remove the address after a 5.7.60 bounce?
- No. The message never left your own mail server. Fix the sign-in or sender settings and send again.