Avoid cloud & cloud-like/mostly-vps providers. While they will most likely not have entire IP blocks straight blacklisted there might be a rule that just brings

Avoid cloud & cloud-like/mostly-vps providers. While they will most likely not have entire IP blocks straight blacklisted there might be a rule that just brings you closer to the spam score threshold. Oddly enough medium-large enterprise is more likely to include those rules - I've recently seen 20% bounce rate on a large mailing list spanning some 300 companies with most of the bounces being due to AWS IP blocks being blacklisted. That's why using Sparkpost for that kind of recipients is a bad idea (all their sending servers are on AWS). Going back to hosting - pick a company that: - lets you set PTR records for your IPs - lets you get your own IP block and assign it however you want (even it is just a tiny one) - offers primarily dedicated servers/collocation - even if their vps is going to be a bit more expensive