Article ID: 122688, created on Aug 20, 2014, last review on Aug 20, 2014

  • Applies to:
  • Plesk for Windows


I not able to send any mail to MailEnable server. When I trying to send a mail I get "503 Bad sequence of commands" on EHLO command.

telnet <server_ip> 25
HELO domain.tld
503 bad sequence of commands


EHLO command was not enabled in 'Allowed SMTP commands' list


Navigate within the administration console to Servers > localhost > Connectors > SMTP. Right click on "SMTP" and select "Properties". Next navigate to the "Advanced SMTP" tab and enable "EHLO" under "Allowed SMTP Commands"

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