Assuming they means “percentage of emails sent by John Smith to you” and assuming you have a reasonable email client, it’s should work like this:
Run a search of all emails from John Smith during the last month. Count ’em.
Add another term for the search: the word “sustainability”. Scan what you got, discard what you don’t want, count what’s left.
Divide the second number by the first number.
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Assuming they means “percentage of emails sent by John Smith to you” and assuming you have a reasonable email client, it’s should work like this:
Run a search of all emails from John Smith during the last month. Count ’em.
Add another term for the search: the word “sustainability”. Scan what you got, discard what you don’t want, count what’s left.
Divide the second number by the first number.