Hi @Carey Rouse ,
Thanks for reaching out.
Klaviyo continually monitors the placement of its IPs on a large number of blocklists and of course has them regularly de-listed as well. In our experience, most blocklists that are not for example SpamHaus do not have a wide impact on an account's deliverability.
Having said that, if you are seeing a significant number of soft bounces on your account or other indications of blocks being made by inbox providers/filters, please reach out to our Support team with examples of campaigns/flows that are seeing these bounces as well as a few profiles that had their emails blocked!