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Mailbox troubleshooting · Practical guide

Microsoft sender address mismatch: verify the authenticated and visible identities

Investigate sending permissions when the requested From address differs from the mailbox that authenticated.

Reviewed · Examples are illustrative

Who this helps: Mailbox owners and administrators validating sending and reply access.

Define the decision

An alias, shared mailbox or display name may look correct in the editor while the provider refuses the actual sender identity. Sending permission and receiving access should be verified for the precise address used.

Work through the procedure

  1. Record the authenticated account and requested From address.
  2. Capture the full provider rejection or received sender headers.
  3. Ask the administrator to verify the intended Send As arrangement.
  4. Confirm the application supports that identity selection, then test both sending and reply routing.

Worked example

The following is a synthetic example for this procedure, not a customer result or performance benchmark.

Authenticated account: [email protected]
Requested From: [email protected]
Provider response: sender permission failure
Next check: supported identity and permissions, not another password reset

Read the result

The mismatch can be intentional but still unsupported by the current connector. Treat a provider-side permission as necessary evidence, not proof that the application actually selects the alternate identity.

Check before moving on

  1. Inspect the recipient-visible From and Reply-To.
  2. Confirm replies return to the connected receiving mailbox.

Limits and next action

The reviewed Zintara flow does not provide a general shared-mailbox or alias selector. Keep unsupported identity requirements explicit instead of promising a configuration-only fix.

Source: Microsoft: recipient sending permissions

Source references

Worked examples are illustrative. Editorial procedures are suggested methods, not measured performance claims or promises of additional product features. Check current provider guidance before changing mailbox configuration.

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