An Address not found delivery failure usually means the receiving system could not recognize the destination as addressed. Check the complete recipient with the person or organization through an established channel. Do not guess alternative addresses and send private content until one happens to work.
Inspect the exact rejected address
- Open the bounce associated with the failed message.
- Compare the rejected address with the address you intended.
- Check spelling on both sides of the @ sign, spaces, stray quotation marks, and trailing punctuation.
- Inspect whether an autocomplete suggestion inserted an old contact address.
A friendly contact name can hide the actual destination. Expand the recipient chip or open the contact record to inspect the full address before composing another attempt.
Confirm changes with the recipient
The person may have changed jobs or addresses, an alias may have been removed, or an organizational account may need administrator attention. The sender cannot fix those conditions by changing their own Gmail password.
If the intended address is a group or managed alias, ask the organization’s administrator to confirm that it exists and accepts your kind of message. A policy rejection and an unknown address can produce different diagnostics, so preserve the actual error text.
Correct the record before resending
Update the contact or saved workflow only after verifying the new address. Check every recipient on the resend, particularly when Cc or Bcc includes other people. Determine whether some recipients already received the earlier attempt before duplicating it.
Do not broadcast a confidential message to several guessed variants. Consumer Gmail’s dot behavior is not a reason to alter addresses at a work or school custom domain.
Repeated invalid-recipient sends can contribute to sending restrictions. If you manage a mailing list, correct or remove invalid destinations through the approved process rather than continuously retrying them. Use a harmless test when appropriate, and treat a corrected address as a routing repair, not independent proof that a sensitive request from that person is authentic.
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References
Reviewed against the linked product guidance, standards, and identified vendor or public-authority guidance on October 29, 2026. Available options and screen labels can vary by account, device, region, and organization policy.