Clean a CSV List of 26,000 Contacts

Hi,

I have an Excel list of just over 26,000 contacts. Its about 6-7 years old.

I would like it cleaned of duplicates, dead email addresses, etc. so it can be used with limited or no bounces.

It has the similar data columns you would expect: First Name, Last Name, Address, Company Name, and Email Address.

This will be used for emailing so only the email address needs to be verified.

Thanks!

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