I configured Relay MTA for external delivery: 184.108.40.206 : 25 to send mail from local user to yahoo or gmail. And this is Mail Delivery System and recive back when sending:
The mail system
<email@example.com>: host 220.127.116.11[18.104.22.168] said: 550
firstname.lastname@example.org must check for new mail first (in reply to MAIL
Please tell me why and how to correct!