Delivery statuses

Status	Meaning
queued	Accepted and waiting to send.
processing	Sending is in progress.
simulated	Sandbox send completed; no email was delivered.
submitted	Accepted by the sending provider.
delayed	Delivery is temporarily delayed.
delivered	Accepted by the recipient’s mail server. This does not confirm it was read.
failed	Sending or delivery failed. Check error_code.
bounced	The recipient’s server rejected the email.
complained	The recipient reported the email as spam.
canceled	Sending was canceled because the template was deleted.

error_code	What to do
delivery_unknown	Submission could not be confirmed. Check email activity before resending to avoid a duplicate.
delivery_expired	The email could not be sent before its delivery deadline. Check whether it is still relevant before sending a new one.
account_inactive	Check the workspace’s sending plan and status.
template_deleted	Choose a published template for a new send.
provider_error	Check email activity and sending setup.

Bounce and complaint reasons may contain values reported by the sending provider.

A submitted or delayed email may receive a later delivery result. A delivered email may later become bounced or complained. Use a polling timeout rather than waiting indefinitely for a final status.