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 183.0.0.0/10 (183.0.0.0 - 183.63.255.255)
To grep the IP range 124.217.224.0/19 (124.217.224.0 - 124.217.255.255) from the maillog:
egrep '124\.217\.2(2[4-9]|[34][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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