this issues always follow the smtp command "DATA" postfix log: 2018-03-28T09:53:25.409198+08:00 localhost postfix/smtpd[30183]: > unknown[10.100.1.237]: 250 2.1.5 Ok 2018-03-28T09:53:25.450287+08:00 localhost postfix/smtpd[30183]: < unknown[10.100.1.237]: DATA 2018-03-28T09:53:25.450309+08:00 localhost postfix/smtpd[30183]: > unknown[10.100.1.237]: 354 End data with <CR><LF>.<CR><LF> 2018-03-28T09:53:25.451396+08:00 localhost postfix/smtpd[30183]: smtp_get: EOF 2018-03-28T09:53:25.451407+08:00 localhost postfix/smtpd[30183]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 10.100.1.85 2018-03-28T09:53:25.451412+08:00 localhost postfix/smtpd[30183]: match_hostaddr: smtpd_client_event_limit_exceptions: 10.100.1.237 ~? 10.100.1.85 2018-03-28T09:53:25.451416+08:00 localhost postfix/smtpd[30183]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 10.100.1.237 2018-03-28T09:53:25.451419+08:00 localhost postfix/smtpd[30183]: match_hostaddr: smtpd_client_event_limit_exceptions: 10.100.1.237 ~? 10.100.1.237 2018-03-28T09:53:25.451423+08:00 localhost postfix/smtpd[30183]: lost connection after DATA (0 bytes) from unknown[10.100.1.237] 2018-03-28T09:53:27.008682+08:00 localhost postfix/
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