Cannot send any mail to MailEnable server. When trying to send a mail,
503 Bad sequence of commands error appears on EHLO command.
telnet <server_ip> 25
503 bad sequence of commands
EHLO command is not enabled in Allowed SMTP commands list
1. Open MailEnable Administration console and navigate to Servers > localhost > Connectors > SMTP
2. Right click on SMTP and select Properties, then navigate to the Advanced SMTP tab
3. Enable EHLO under Allowed SMTP Commands