Data Processing

I have a list of approximately 50K contacts with name, address, email, etc. They are on an Excel spreadsheet. To clean the list of bad email addresses I had to separate the email addresses from the rest of the records. Now I have approximately 39,000 good email addresses. The good email addresses must be rejoined with their records and the bad records eliminated so when done I will have approximately 39,000 complete records properly matched. Reply with HAGAJI in your bid so I know that you have read this and pay attention to detail. Tell me briefly how you would go about this.