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Slapdash Analysis of Postfix Mail Log

Here's a quick one-liner to generate statistics about how often hosts from certain countries tried to deposit mail without having proper (reverse) DNS entries:

sed -n -e 's/.*NOQUEUE:.*from unknown\[\([0-9.]\+\)\].*/\1/p' mail.*| \
xargs -l geoiplookup| \
awk -F, '{print $2.trim}'| \
sort | uniq -c | sort -rnk1

The output looks something like this snippet, based on logs from July 21 to August 5 on my mail server:

Germany comes in 33rd.

By Shadowdancer, 2010-08-05, 16:55; permalink;
Last updated at 2010-08-05, 16:58 by Shadowdancer