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500 syntax error command not recognized

But I get error 500 5. 1 Command unrecognized" " when I send all other messages. I am sure it is not syntax error that causing the problem. , mailbox not found, no access] 451 Requested action aborted: error. 450 – Requested mail action not taken, mailbox unavailable. 451 – Request action aborted. 500 – Syntax error, command not recognized. 550 – Requested mail. 500 Syntax error, command unrecognized helo. So it is not my firwall because telnet from UT not display this error. I' m not using Protocol. Since it has been a common source of errors, it is worth noting that spaces are not permitted on either side of the colon following FROM in the MAIL command or TO in the RCPT command.

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    Error recognized command

    Earlier versions of. In a cemetery, what evidence could be found that humans were intelligent and had technology? If you receive an error message like, " Could not send your message. 500 - The server could not recognize the command due to a syntax error. 10022, field was not found in mail Header. 10037, SMTP 500 - Syntax error, command unrecognized. 10039, SMTP 502 - Command not implemented. Turns out this was a firewall issue. Our Cisco firewall was set to perform ESMTP Inspection, and we followed this guide to disable it. 35: 08 - ( not logged in) ( 10. 136) > 500 Syntax error, command unrecognized. Please let me know how can I.

    Error Description: This response indicates that a SMTP command was received by the. 500 Syntax Error, command unrecognized. or server has sent a command that is not recognized by the MailEnable SMTP service.