email list cleanup

Umm.... it's a little more complicated than that. What's wrong with your list?

Its old, has bounces, and not sure many are correct. There are programs for this, not sure which one actually works.

You have 2 issues.

Deduplication is easy, and can be done by any semi-competent dba or programmer. Any program that promises deduplication is likely to work.

Validation is hard. You have to actually send email to all of the list, track bounces, and clean the list accordingly. It is a whole process that takes a lot of time and effort.
I wouldn't trust packaged software that promises to easily validate your list. I would try to use a service that may already have validated millions of emails and validates by crossing your lists with their lists.

In any case, please don't do the despicable practice of using a return address out of your domain, dumping the bounces and rejects on innocent 3rd parties.  Pricks who do that eventually run into crazy bloodhounds like me who know how to track and how to bite :)

Thanks, but there has to be some good software out there to text valid emails...?