The message 'The send outcome could not be confirmed' means the request may have completed without a reliable local response. Retry with the same details as directed by the delivery panel to avoid preparing a duplicate send.
Keep the recipient, CC addresses, email type and reviewed delivery time unchanged while resolving the original request. Refresh history and inspect any saved delivery record. A delayed success message is different from a confirmed failure.
For a scheduled email, the retained request keeps the exact reviewed timestamp even if a later retry occurs after that time. Do not create a new schedule merely because the original selected time is now in the past. Establish its recorded outcome first.
If the invoice changed, the panel asks you to refresh and review the recipient again. Follow that source-change path rather than treating it as a transient network issue. Once the original result is known, decide whether any new communication is needed using the current document and delivery history.
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