I configured Relay MTA for external delivery: 220.127.116.11 : 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
: host 18.104.22.168[22.214.171.124] said: 550
firstname.lastname@example.org must check for new mail first (in reply to MAIL
Please tell me why and how to correct!