Which method is NOT considered an approved method for updating addresses before mailing?

The correct choice is the method of using manual corrections by mail. This approach is not considered an approved method for updating addresses before mailing primarily because it is prone to errors and delays. Manual corrections may involve recipients sending back updates on paper, which can lead to misinterpretation, misfiling, or even loss of data. Furthermore, this method lacks the efficiency and reliability of automated systems designed to maintain accurate address databases.

In contrast, methods like the National Change of Address (NCOA) and Address Change Service (ACS) utilize systematic processes to ensure that address information is current and accurate. These methods pull from official databases and are designed to handle large volumes of address changes efficiently. Direct database entries, when properly managed, can also provide accurate updates but rely on meticulous data management practices.