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Since Google controls both the sender and receiver in the case of a Gmail-to-Gmail conversation, couldn't they skip actually sending the email and route it internally? Why is there a need to invoke SMTP and everything? There is no cross-server communication that is needed.

Streetlamp
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1 Answers1

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There are different(!) "e-mail protocols" for sending emails and for receiving them. SMTP is for receiving.

Mike Robinson
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