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An Apex trigger is one way. I would say once you have an email address for a record, deleting it completely rather than marking it as future-unusable is poor practice. Otherwise, you have no way to correlate old emails (inbound or outbound) with a known contact.
I hope this helps:
From the profile in Salesforce, you can de-select delete under the Field Level Security for the Object (Lead, Account, Opp, etc...) It is good practice to prevent reps from deleting records.