report on recipients/msg
# awk ' /mx1 postfix\/nqmgr.*nrcpt/ {print $9}' /var/log/maillog |\
sort -f | uniq -ci | sort -fr | less
4707 nrcpt=1
3190 nrcpt=2
48 nrcpt=3
16 nrcpt=6
16 nrcpt=5
13 nrcpt=4
4 nrcpt=8
4 nrcpt=7
4 nrcpt=11
3 nrcpt=9
3 nrcpt=40
3 nrcpt=10
2 nrcpt=24
2 nrcpt=17
1 nrcpt=20
1 nrcpt=13
1 nrcpt=12
