Which Apple product uses TCP port 25 for sending emails?

The correct answer is Mail because it is the application specifically designed for sending and receiving emails on Apple devices. TCP port 25 is the standard port used for Simple Mail Transfer Protocol (SMTP), which is the protocol employed for sending emails across the Internet. When users send emails via the Mail app, it utilizes this protocol and port for the outgoing mail server communication.

Other options do not involve sending emails in the same manner. Safari is a web browser used for internet browsing and does not utilize SMTP directly. iMessage is a messaging service that uses its own protocol for sending messages and does not rely on SMTP or port 25. Notes is primarily a note-taking application and does not function for sending emails, making it unrelated to the context of email transmission. Thus, the Mail application is clearly the one that directly interacts with TCP port 25 for the purpose of sending emails.