This is from a tech support call. Personally, that the GUI logs don't include message size is really sad.
You need to be on the Command Line "Support" interface. SSH to your SBG Scanner, login and then run set-support to enable the support account with a password of your choosing. Logoff and then login as support.
tail -f /data/logs/maillog |
awk '/Received on\:/ {print $18 " " $21 " " $23 " " $25}’
10.20
.65.26:25, 10.20.159.247:56385,
tracyjaynes@gmail.com, 3035,
10.20
.65.26:25,
10.20
.159.247:56385,
ALSCPA@aol.com, 3287,
10.20
.65.27:25, 10.11.81.130:40404,
DoNotReply@domain.com, 27168,
Local i/f remote port Sender Size
use $15 for auditID