or download this
Jun 7 15:44:46 gw3 postfix/qmgr[22316]: AAAF220809D: from=<m@mail.atu
+g.org.au>, size=114013, nrcpt=1 (queue active)
Jun 7 15:44:46 gw3 postfix/smtpd[31899]: EBBF220809B: client=localhos
+t.localdomain[127.0.0.1]
Jun 7 15:44:46 gw3 postfix/smtpd[32134]: disconnect from austra1778.l
+nk.telstra.net[165.228.245.121]
...
Jun 7 15:44:55 gw3 postfix/smtpd[28184]: disconnect from iptel.kbrnet
+.ru[62.183.83.35]
Jun 7 15:44:55 gw3 postfix/smtpd[32294]: warning: 203.20.159.130: hos
+tname mail50.gsjbw.com verification failed: Name or service not known
Jun 7 15:44:55 gw3 postfix/smtpd[32294]: connect from unknown[203.20.
+159.130]