Bounces and Deferrals – Email Status Categories

Situation – You are unfamiliar with the status category of an email that was bounced or deferred.

Solution – See the below table for each status category and a brief description, as well as a link to another article about understanding specific error codes.

Bounces And Deferrals Troubleshooting


Messages that are sent through Spambrella​​ platform and are delivered.


Messages that are quarantined by one of the filters on the platform. These messages can be released from Quarantine


Messages that are blocked because of a virus or executable file. Messages that are blocked cannot be released.


Message could not be delivered to the client’s/recipient’s server. These errors are temporary and normally result in 400 error codes.

Messages will be re-tried up to 30 days. These emails will be automatically retried once every 5min, 15min, 30min and 1 hour after that for the next 30 days.


Messages did not get delivered to the Recipient/customers server. Messages get sent a Non-Delivery Report (NDR). These are what we call a “hard bounce” normally 500 error codes. These messages will need to be resent. 


This is a placeholder for our back-end logs to update the Front-end UI logs. This normally doesn’t indicate whether the​​ message was delivered or not. If you want to know the true status please contact support.


If you still have questions about errors and codes? Click here to understand more about what the error codes mean.

Error When Saving a Filter: Address Contains Invalid Characters

Search logs for a specific email

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