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            - msg          : The message to send.
            - mail_options : List of ESMTP options (such as 8bitmime) for the
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            - rcpt_options : List of ESMTP options (such as DSN commands) for
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         SMTPRecipientsRefused  The server rejected ALL recipients
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         SMTPSenderRefused      The server didn't accept the from_addr.
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