Oct 8 14:15:08 net2 sendmail[27018]: e98CF7X27018: ruleset=check_rcpt, arg1=, relay=IDENT:root@[202.106.155.68], reject=550 5.0.0 ... Your domain spammed us Oct 8 14:15:09 net2 sendmail[27018]: e98CF7X27018: from=, size=696, class=0, nrcpts=0, bodytype=8BITMIME, proto=ESMTP, daemon=MTA, relay=IDENT:root@[202.106.155.68]