I worked at a place where legal swooped in and banished reuse of email addresses for an odd long period (like 7 years). That created problems with contractors

I worked at a place where legal swooped in and banished reuse of email addresses for an odd long period (like 7 years). That created problems with contractors as any interruption in service required a new address. So we had a few John.Smith183@example.com in the org.