I cannot send from another address, I get rejected
'Send As' rights are granted separately from mailbox access. If you can read but not send, that exact right is missing.
Try this first
- 1Confirm which address you want to use. People often mix up 'Send As' with 'Send on Behalf'; the latter shows recipients you send on someone else's behalf.
- 2Ask your admin to grant you explicit 'Send As' on that mailbox.
- 3Close Outlook, wait a few minutes, reopen; rights do not always propagate immediately.
- 4Type the From address manually the first time; next time it appears in the dropdown.
When to bring us in
If the steps do not help, there may be a directory-sync conflict or an older policy in your tenant. Forward the exact error message.
See also
- Our emails land in spam for some recipientsAlmost always an SPF, DKIM, or DMARC setting that is wrong or missing, or a sender name that mimics a well-known brand.
- Someone reports receiving phishing emails "from us"Read: spoofing. Someone is abusing your sender name, not necessarily your actual mailbox.
- An email bounces (NDR): delivery failedThe NDR text usually states the exact reason. Reading it is step one.
None of the above fits?
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