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Why is the email sending process not symmetric with the receiving process?

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Reading https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure) , I wonder why the email sending process is not symmetric with the receiving process? The sending process has no something similar to MDA, and MUA contacts MTA directly for sending emails. (Imagine when mailing a letter, we go to the nearest public mailbox on streets, and mailmen collect mails from them twice a day.) - How does MUA know what emails have been sent? (How does MUA get the emails in the "Sent" folder?) - Are sent emails stored in the same place as received mails in MDA in a server?
Asked by Tim (106420 rep)
Sep 11, 2020, 09:35 PM
Last activity: Sep 22, 2020, 10:15 PM