Enabling debug for the Servers IP, here comes. Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-ERLAY_HOST Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-PIPELINING Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-SIZE 20971520 Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-ETRN Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-STARTTLS Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250-ENHANCEDSTATUSCODES Aug 5 15:22:35 intsrv025 postfix/smtpd[1412]: > SERVER_HOST[SERVER_IP]: 250 8BITMIME
So, the Relay it's responding OK. The problem for sure is on the Server.
