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Useful for grepping an IP range from the maillog. When for instance dealing with a spam-run from a specific IP range, or when errors occur from or to a specific IP-range.
In the example above the IP range 188.8.131.52/10 (184.108.40.206 - 220.127.116.11)
To grep the IP range 18.104.22.168/19 (22.214.171.124 - 126.96.36.199) from the maillog:
egrep '124\.217\.2(2[4-9]|[0-9]|5[0-5])' -J /var/log/maillog*
NOTE: the location of the maillog may vary based upon operating system and distribution.
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