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I have a old list of over 20 000 emails, we used to use an old system from our server that didnt give any Analytics, so we dont know what bounced what went to spam etc....
I would like to clean this list, get rid of all bounce emails. before i send another newsletter,
Can you guys help with any ideas.
You'll want to find a "list cleaning" service. You can search Google as there are tons of them. Basically you want to have one of these third-party cleaning services check your emails for things like old accounts etc. For 20k you're probably looking at $100-$300 if I was guessing. This is far from a guarantee but it's a good start to get some of the more obvious problems off your list. If you plug that list into Amazon without cleaning it you're likely to lose your account.
Unfortunately none of this services is as efficient as actual send. Try to find an affordable email service if you want keep a good reputation on Amazon.