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At the end of the day you are going to have to process bounces to accurately verify lists, and that involves emailing them. The concept of cleaning lists by any other way than sending to them, as is implied here, is flawed. The mailer will tell you which domains are bad and the bounces will tell you which accounts are undeliverable. That's how you get comprehensive validity.
To your point of limited resources Damian that just goes hand in hand with the unpreparedness of any lists. 100% valid lists will not make up for a shortage of ips.
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