What is a required action when handling accountable mail?

When handling accountable mail, ensuring that verification is completed is a crucial action because accountable mail requires a higher level of security and tracking than regular mail. This type of mail typically includes items such as registered mail and certified mail, which must be tracked and confirmed at each stage of handling until the item reaches its final destination. Verification might involve obtaining signatures from the recipient to confirm they have received the mail, and it often allows for tracking the mail's journey through the postal system. This process is essential to maintain accountability and traceability, thereby safeguarding valuable or sensitive items being sent through the mail system.