At its simplest, a message file serves three primary purposes:

Large-scale database files used to archive entire mailboxes rather than single messages.

Secure message files (like S/MIME) use digital signatures to verify the sender's identity. If you'd like to dig deeper into this, let me know:

It bundles the sender's content, metadata (date, time, sender/receiver), and any attachments into a single unit.

Do you need help an old message file?

Modern formats used by web applications and APIs to exchange message data between servers. 🛠️ Strategic Importance