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A delivery status message stating that the email could not be delivered to the address for a temporary reason. A temporary error message some times called a temp fail.
Common Reasons for getting soft bounces
The user's mail box is full, exceeded the quota
The mail server is too busy
What to do with Soft Bounces
Soft bounces should be monitored, if an address is consistently soft bouncing you may want to remove it from your list after a few consecutive soft bounces.