i think the problem is straight forward and should be very simple to write a perl program for the same, below is the program. i havent run it to check if it works fine. comments are welcome

1. Assuming table 1 having the address has a structure

address_tbl (mailaddress char(255))

2. Assuming table 2 having the count of domains has a structure

domain_count_tbl (domain char(255), count int)

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