How can I best utilize Scrubby?

Use Scrubby only for your "risky" emails — not for your whole list. That is where it earns its keep, and it keeps your credit spend down.

The pattern that works:

1. Run the full list through your existing SMTP tool first
2. Send only the addresses it could not resolve to Scrubby
3. Merge the results back before you send

Why those addresses are the ones that matter:

• SMTP tools (ZeroBounce, NeverBounce, MillionVerifier) return these as *Catch-All* or *Accept-All* rather than valid or invalid — the server accepted the handshake, so they cannot tell you more.
• Data providers (ZoomInfo, Apollo, Cognism) return them as *Risky* or *Guessed*, or attach a confidence score under 90%.

Either way you are left guessing on a segment that is often a large share of the list. Scrubby resolves that segment specifically, which is why running your already-valid addresses through it is wasted spend.