Add comprehensive email validation for blocked users - #8

Bugbot Analysis Progress (2m 12s elapsed)

✅ Gathered PR context (2s)
✅ Analyzed code changes (1s)
✅ Completed bug detection — 0 potential bugs found (2m 7s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_74c9b388-cedf-4b72-aa75-094dc8cb90e9