Dummy mail generator which saves the mails into monthly directories
#Usage
./dummy-mail-gen.rb year_begin month_begin year_end month_end num_mail_per_month
example: The following command line generates 100 mails per month since April,2012 until March,2013.
$ ./dummy-mail-gen.rb 2012 04 2013 03 100
$ ls
201204 201206 201208 201210 201212 201302 dummy-mail-gen.rb
201205 201207 201209 201211 201301 201303
$ ls 201204
1333238400-524838f14e985_1ed47d90248067e@localhost.localdomain.mail
1333238400-524838f151966_1ed47d90248074@localhost.localdomain.mail
1333238400-524838f154013_1ed47d90248086d@localhost.localdomain.mail
...
The filename of each mail is consist of UNIX-time and Message-ID of the mail.