Jan 3 01:28:41 mailhost qmail: 883771121.438260 new msg 34692 Jan 3 01:28:41 mailhost qmail: 883771121.438592 info msg 34692: bytes 1549 from <shubha@chem.iitb.ernet.in> qp 30023 uid 61 Jan 3 01:28:41 mailhost qmail: 883771121.474210 starting delivery 29480: msg 34 692 to remote aparajit@giasmda.vsnl.net.in Jan 3 01:28:52 mailhost qmail: 883771132.731365 delivery 29480: success: 202.54 .6.161_accepted_message./Remote_host_said:_250_BAA28864_Message_accepted_for_del ivery/ Jan 3 01:28:52 mailhost qmail: 883771132.876612 starting delivery 29481: msg 34 696 to remote shripati@cicso.com Jan 3 01:28:52 mailhost qmail: 883771132.909858 end msg 34692 Jan 3 01:28:55 mailhost qmail: 883771135.217514 delivery 29481: deferral: Sorry ,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/ Jan 3 01:29:24 mailhost qmail: 883771164.220886 starting delivery 29482: msg 34 685 to remote vbalaji@us.oracle.com Jan 3 01:29:34 mailhost qmail: 883771174.256567 delivery 29482: success: 192.86 .155.82_accepted_message./Remote_host_said:_250_LAA10482_Message_accepted_for_de livery/ Jan 3 01:29:34 mailhost qmail: 883771174.292873 end msg 34685Raw data above can be processed by scripts to find top 10 users, top 10 by size...