Also curious to know what impact they are seeing. A lot of blocklists may publish blocks on shared IPs but aren’t actually used by filtering services so they don’t cause any bounces.
If we notice higher than a 0.1% soft bounce rate for any blocklist then we will take action to delist the IP with that RBL (registered blocklist), and we will also work with the customer that caused them to block us in the first place. If necessary we will suspend them from emailing again to prevent it from happening again in the future.
In general though our overall delivery rate is always around 98% or more.
We have systems in plce to alert if drops occur and we take the same sort of actions to rectify the problem if that happens.
Dedicated Ip is great though, but only if your deliverability is better than our shared. If you do not have better contacts / engagement than the average customer on the shared then you should generally stay on the shared IPs. You also only really get value from a dedicated IP if you send over 20,000 emails per month.