Scheduled Service Change: Increase Hub Transport Retry Period
Messages that are having temporary delivery problems will be retried for a greater period of time which should reduce the chances of bounced messages. Note: Messages that have permanent delivery failures will be returned immediately as they are now.
There is no workaround for this issue
The messaging team will be increasing the Retry Period for email messages from two days to five days. Messages that are temporarily undeliverable are currently re-queued for two days. If they cannot be delivered within that period they are returned to the sender. This change will increase the retry period to five days.