Documentation
The outcome is unknown.
The request timed out after the message may already have been accepted, so Mailtruss does not know whether it was sent.
What it means
When Mailtruss hands a message to the delivery network, the network normally answers at once. If the request times out, there are two possibilities: the network never got it, or it got it and the answer was lost on the way back. They look identical from here. Retrying automatically would deliver the message twice in the second case, so Mailtruss does not retry. It marks the message Unknown and leaves the decision to you.
Typical codes and wording
status Unknown (no reply: the request timed out)
Common causes
- A network timeout between Mailtruss and the delivery network.
- A brief outage on the delivery network at the moment of hand-off.
What to do
- Check whether the recipient received the message, if you can.
- If it did not arrive, send it again. Sending again is safe only because you know the first one did not go.
- Use an idempotency key on your own requests: the same key never sends twice, so your own retries after a timeout are always safe.
- If many messages end up Unknown at once, check the status page.
What Mailtruss shows
The message's status is Unknown, with the diagnosis "Outcome uncertain", and it is not retried.
Is it safe to retry?
Only if you have checked that it did not arrive.