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To record send log data, the send logging feature must be enabled for the send. This can be done by selecting the send log data extension in the Delivery Options tab of the email send wizard.

 Burst sending is the functionality that would get messages out the door faster. Burst sending allows you to send large volumes of email in a short period of time by bypassing some of the standard send processes. Burst sending is ideal for time-sensitive or urgent messages that need to reach a large audience quickly

Overwrite is the import type that should be used when the data extension contains all current product information and the product catalog is never the same. This import type will delete all existing records in the data extension and replace them with the new records from the CSV file

The best way to prevent the prefix [PREVIEW] from deploying in live sends is to wrap the subject line with AMP script that checks if the send is a test send or a live send. For example:

%%[

IF _IsTestSend == true THEN

SET @subject = "[PREVIEW] " + @subject

ENDIF

]%%

Using Proof instead of [PREVIEW] does not solve the problem, as it still shows up in live sends. Adding [PREVIEW] to the subject line validation list does not prevent it from deploying, but rather prevents any email with [PREVIEW] in the subject line from being saved. Requiring several campaign approvals does not guarantee that the prefix will be removed before sending.