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A delivery status message stating that the email could not be sent by the senders email server, but it is still trying.
Common Reasons for getting transient bounces
The recipient's email server is down
What to do with Transient Bounces
Transient bounces do not require that you remove the address from the list, they typically will be resolved when your SMTP server tries to send the email again at a later time. Most email servers will try sending a message for several days.