Blacklist domains

I have a problem with robots using invalid protonmail.com accounts and I would like to skip tracking for all protonmail.com address. I have looked at the code but there does not seem to be any hook that I can use to make this exception. I would be nice if there was a hook on line 46 in modules/cart-abandonment/classes/class-cartflow/ws-ca-tracking.php where I can hook in my own filter code and return false if the domain is on my blacklist. Or if you could add a domain blacklist feature to this plugin.