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Understanding postfix log

From: Victor d'Agostino (d.agostino.victorgmail.com)
Date: Wed May 15 2013 - 04:20:30 CDT


Hello,

Can someone explains to me (or give a link) in this log

May 15 10:58:13 LXLYOPFD11 postfix/smtp[12232]: B7B1B4800DC: to=<
xxxxgmail.com>, relay=10.220.8.20[10.220.8.20]:25, conn_use=7, delay=1991,
delays=0.06/1990/0/0.66, dsn=2.0.0, status=sent (250 2.0.0 OK 1368608293
fe7si6820218wib.77 - gsmtp)

What does "conn_use", "delays=a/b/c/d" and "dsn"means

Thanks in advance !

Victor