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  2. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    421 Service not available, closing transmission channel (This may be a reply to any command if the service knows it must shut down) 432 4.7.12 A password transition is needed [ 3 ] 450 Requested mail action not taken: mailbox unavailable (e.g., mailbox busy or temporarily blocked for policy reasons)

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