4 thoughts on “Using telnet to send email

  • I can't send my email, i get this error: 550-5.7.1 [<my_ip>] Messages missing a valid messageId header are not

    550 5.7.1 accepted

    I have examined wireshark capture and there is more information at SMTP package: Response code: Requested action not taken: mailbox unavailable (550).

    Do you know any solution? thanks

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