Exclusion script breakup

@Nupur Jain

It checks whether the subscriber’s email address exists in the exclusion Data Extension. If ROWCOUNT(...) > 0, then the subscriber is found in the exclusion DE and should be excluded from the send.

ComponentMeaning 

LOOKUPROWS() | Searches a Data Extension for rows that match a specific field and value. Returns all matching rows. 

"Exclusion_DATA_EXTENSION_NAME" | The name of the Data Extension being checked. This is where exclusion records are stored. 

"EMAIL_ADDR_FIELD_NAME" | The column in the Data Extension to compare (e.g., EmailAddress). 

EMAILADDR | The value being checked — usually the subscriber's email sent in the context of a send. 

ROWCOUNT() | Counts how many rows the LOOKUPROWS function returned. 

> 0 | Checks if the count is greater than zero (meaning at least one match exists).