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 EHLO 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"