ListWise

ListWise takes a two-step approach to verification: it first checks DNS MX records to confirm a mail server exists for each domain, then performs SMTP handshake validation to test whether the mail server will accept mail to that address. The tool organizes results into distinct categories, so you know exactly which addresses are valid, invalid, disposable, or risky to send to.

The categorization approach is helpful for marketers building segmented strategies rather than just list purging. You can suppress disposable addresses for long-term campaigns while testing risky addresses with smaller sends, or focus on your most deliverable contacts.