Free / Disposable Domains List
Provides a list of about 4000 free / disposable domains to map emails against.
Est run time: 10-15s.
Usefulness: In B2B marketing, free / disposable domains are worth close to zero. Sometimes even less than zero because there's an opportunity cost of dealing with low-value leads. This list could be useful for proactively excluding those leads from scoring / routing / etc.
Caveats: New temporary email services pop up every day, but this list should cover like 98%+ of used ones (at least according to our intern Steve).