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What are the advantages of email over instant messaging?

Email is permanent and formal, while instant messaging is temporary and casual.

An instant message is a signal flag between two ships, quick and situational. An email is a captain's log or a sealed diplomatic pouch, permanent, searchable, and part of the official record.

It also carries legal weight. You cannot send a contract over Slack. Email creates a time-stamped paper trail that is admissible in court.