I have a spreadsheet, unsubs-4.csv, attached.
In Col A is listed about 5,600 email addresses.
I need a function, that goes through all spreadsheets (.csv, .xls, .xlsx, .xlsm, etc.) found in folder:
finds all matches to the emails in unsubs-4.csv and deletes them (from all spreadsheets,
regardless of extension) that are found in the 'email_list' subfolder.
Any questions, please feel free to ask.