What should be noted about certified mail in terms of international delivery?

Certified mail is a service that provides a receipt confirming the delivery of mail, and it also offers a tracking feature. However, the availability of certified mail for international delivery is limited. Many countries do not offer certified mail services, which means that it cannot be universally used for international shipments.

The correct understanding revolves around the fact that certified mail is not an option for all international services, which aligns with the reasoning that it is not available in every case when sending mail internationally. While certain countries may provide similar tracking services or alternatives, certified mail itself is not universally applicable to international mailings.

Thus, the statement about it not being available for any international service accurately reflects its limitations in global contexts.