Hello, I'm new to internet marketing and have not found much information regarding how people with large lists avoid high bounce rates on their email blasts. I know of services such as neverbounce,briteverify and kickbox but they are expensive when checking 50,000+ emails. I found out about atomic email verifier which is a one time fee, but was hoping someone with experience in this area could advise me regarding how professionals clean their lists. I scrape emails and send them messages and my bounce rate is very high. Spark post recommended I use a email list cleaning service. I also saw that there are smtp based programs but they can get one blocked by the ISP unless one has alternating ip's and proxies? I don't really understand. I would love to get an smtp based system operational as it seems to be the most cost effective. Thank you for any help!