Question: Why can't we use SMTP to retrieve emails from a mail transfer agent (MTA)? I design a modication of SMTP as follows: the MTA will

Why can't we use SMTP to retrieve emails from a mail transfer agent (MTA)? I design a modication of SMTP as follows: the MTA will poll for the user agents (UAs); whenever it will nd out that a UA with a new email in its mailbox at the MTA is online, it will use SMTP to push the email to the client mailbox at the UA. Do you see any problem in this modication of the protocol?

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