In B2B cold outreach, 30% to 43% of corporate domains configure Catch-All (Accept-All) mail servers. To capture those leads, many Clay, Instantly, and Smartlead users route their lists through specialized catch-all tools like BounceBan ($300 per 100K) or Scrubby.io ($800 per 100K PayGo in 1-credit Quick mode, or $2,400 per 100K in 3-credit Deep 72h burner-send mode; $497/mo on its Pro 100K subscription).
Before paying 5x to 40x more per email—or waiting 72 hours for burner emails to hit your prospects’ inboxes—it is critical to understand how corporate Catch-All verification actually works at the SMTP and directory level, and how MailVeri ($59/100K, $299/1M) isolates hard bounces on Catch-All domains at standard 1-credit pricing.
1. Pricing & Turnaround Time: BounceBan vs. Scrubby.io vs. MailVeri
| Feature / Tier | Scrubby.io (Oct 2026) | BounceBan (Oct 2026) | MailVeri |
|---|---|---|---|
| 10,000 Credits | $80.00 Quick / $240.00 Deep ($97/mo 15K) | $40.00 ($4.00 / 1K) | $9.00 (Save 78% – 96%) |
| 100,000 Credits | $800.00 Quick / $2,400.00 Deep ($497/mo Pro) | $300.00 ($3.00 / 1K) | $59.00 (Save $241 – $2,341) |
| 1,000,000 Credits | $8,000.00 PayGo ($8.00 / 1K) | $1,700.00 ($1.70 / 1K) | $299.00 (Save $1,401 – $7,701) |
| 5,000,000 Credits | Custom Enterprise Quote | $6,500.00 ($1.30 / 1K) | $999.00 (Save $5,501 / 85%) |
| Turnaround Speed | Quick (1 cr) or 48–72h Deep (3 cr/email) | Real-Time & Batch | Real-Time API & Fast Bulk |
| Sends Real Emails to Prospects? | Yes in Deep 72h mode (Alerts gateways) | No | Never (100% Non-Invasive) |
2. The Hidden Risk of Scrubby.io’s 48–72 Hour Burner-Send Model
In its Deep Verification mode (3 credits per email), Scrubby.io works by actually transmitting live emails from sacrificial domains to your prospects and waiting 48 to 72 hours to observe whether an asynchronous bounce returns. This creates two serious operational problems for B2B outbound teams:
- Security Gateway Fingerprinting: Enterprise secure email gateways (Mimecast, Proofpoint, Barracuda) log sacrificial probe deliveries, alerting IT administrators and often triggering stricter spam filtering just before your real cold email sequence arrives.
- 3-Day Pipeline Delay & $8–$24/1K PayGo Cost: Paying $800 per 100,000 leads in Quick mode—or $2,400 per 100,000 leads in 3-credit Deep mode while stalling your Clay or Instantly pipeline for 3 days—makes high-volume outbound economically unviable.
3. How MailVeri Detects Disabled Accounts on Catch-All Domains Instantly
Even when a Google Workspace or Microsoft 365 organization enables domain-wide Catch-All routing, suspended or disabled former employees (turnover accounts) are evaluated before the wildcard fallback rule at the SMTP RCPT TO stage:
# Same SMTP session on a Google Workspace Catch-All domain (example-corp.com)
S: 220 mx.google.com ESMTP
C: EHLO verifier.mailveri.com
S: 250-mx.google.com at your service
C: MAIL FROM:<[email protected]>
S: 250 2.1.0 OK
# 1. Random nonexistent address -> Accepted by Catch-All routing rule!
C: RCPT TO:<[email protected]>
S: 250 2.1.5 OK
# 2. Former employee whose account was Suspended by Admin -> Hard Bounce!
C: RCPT TO:<[email protected]>
S: 550-5.2.1 The email account that you tried to reach is disabled. Learn more at
S: 550 5.2.1 https://support.google.com/mail/?p=DisabledUserMailVeri automatically isolates these 550 5.2.1 Disabled and directory-blocked accounts as INVALID (read the full RFC breakdown in Why Catch-All Domains Still Return INVALID (550 5.2.1) Bounces and Catch-All Emails Explained) while accurately flagging active wildcard domains as CATCH_ALL—all included in our standard $59 / 100K ($299 / 1M) rate card. Compare full details on MailVeri vs BounceBan and MailVeri vs Scrubby.io, or see how to wire this into Clay HTTP API waterfalls.