Filtering Leads from Massive List of Domains

[Anonymous]

Here's the challenge:
We currently have a subset of prospects we do not want to move through the funnel. The alternative to adding new fields to our forms to filter for these folks, is to have a campaign on the backend listen for folks containing a specific domain in their email address. 

We have all 80,000 domains we want to filter new leads through. The campaign would tag them on a specific field so they can be tracked through our lead management process. 

Due to the large volume of data, how do you suggest we manage this process? APIs? Webhooks?

Thanks!

John

[Josh_Hill13]

Webhooks may work best as you can have only 2499 lines in a smart list filter. So when a lead comes through, it calls the webhook, checks against list, then says "OK=TRUE" or "OK = FALSE" so the MQL flow is then triggered if TRUE.