Summarize email thread recipients to a spreadsheet

If you followed Do something useful with GAS in 5 minutes, you'll already know how to use a spreadsheet as a database. This time, here's how to search your mail for some threads on a particular subject and extract who and when you mailed to a spreadsheet. This is a step by step version of topics covered in Summarizing emails to a sheet

do something in 5 with gas-7-email log

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