If you are looking for a free Clearout alternative, you are probably hitting one of three things: slider-based pricing that is hard to predict, "valid" verdicts that do not show you why, or a lack of recurring free volume to actually evaluate the tool on a real list.
MailCull is built differently. One flat $19/month price. Twenty plain-English checks per email with the SMTP reply, the resolved MX record, and a confidence score on every verdict. Free tier includes 100 deep-scan checks per month plus 1,000 deep-scan list rows per month — recurring, not one-time.
What MailCull does that Clearout does not
The evidence chain on every verdict
Clearout returns a verdict — valid, invalid, accept-all, unknown — and a sub-status for some categories. They do not surface the SMTP reply, the MX record, or a per-check confidence score in their API or dashboard.
MailCull returns the verdict plus a 20-code evidence chain. A real example for a corporate Microsoft 365 address:
[email protected] ✓ deliverable
─────────────────────────────────────────────────────────
syntax_valid Email format passed RFC 5321 validation
mx_found MX record: enterprise-corp-com.mail.protection.outlook.com
provider_microsoft Microsoft 365 protected tenant
m365_http_enum Microsoft confirmed mailbox via GetCredentialType
m365_smtp_corroborated SMTP probe agreed: 250 OK on RCPT TO
tls_upgraded STARTTLS handshake completed
smtp_confirmed Server returned 250 2.1.5 OK
Confidence: 0.94 Source IP: probe-1.mailcull.ioFor agencies running list hygiene as a billable service, the evidence chain is the deliverable — a defensible audit trail for every verdict. Clearout's verdict alone is not.
Recurring free tier with the full pipeline
Clearout's free tier is 100 verifications, one-time, on signup.
MailCull's free tier is 100 deep-scan single-checks plus 1,000 deep-scan list rows, every month, recurring. Quick-scan unlimited. Read-only API access included.
The deep-scan checks include the full evidence chain — same engine Pro and Scale customers run. We charge for volume, not for the moat.
Flat predictable pricing
Clearout's slider-based pricing drops the per-credit rate as you commit to larger packs. It is competitive at very high volumes (1M+/month), but at 5K-100K it is hard to predict and not flat.
MailCull is $19/month flat for Pro (5,000 single-checks, 100,000 list rows), $49/month for Scale (25,000 single-checks, 500,000 list rows). No credits, no charge for unknowns.
The Microsoft 365 corporate cascade
Microsoft 365 protected tenants are the hardest validation case in the category. Microsoft EOP returns 250 OK for some non-existent mailboxes (anti-abuse heuristics) and 550 5.4.1 for some real mailboxes (rate-limiting probe IPs).
Clearout, like most validators, handles this by returning unknown or accept-all for many M365 corporate domains.
MailCull runs getuserrealm.srf → GetCredentialType → Autodiscover v1, with an SMTP cross-check at the end. The result: definitive verdicts on M365 corporate addresses where most competitors give up.
Where Clearout is still the right answer
In the interest of fair framing:
ISO 27001 + SOC 2 Type II claims. Clearout claims both. If your procurement specifically gates on ISO 27001 (more common in EU enterprise), Clearout has a meaningful advantage. We do not pursue ISO 27001; our SOC 2 Type II is in audit-in-progress status.
Native ESP / CRM integration breadth. Clearout has direct integrations with HubSpot, Salesforce, Mailchimp, ActiveCampaign, and others out of the box. Our Zapier and Make integrations ship in Q2 2026; native integrations roll out across Q2-Q3.
Internationalized email (IDN) handling. Clearout has reportedly stronger handling of non-Latin character internationalized addresses. If your lists include significant international volume, this is worth testing.
High-volume slider pricing. At 1M+/month, Clearout's slider drops to a per-credit rate that becomes attractive.
Honest accuracy comparison
Clearout claims 98% accuracy. We have not seen widely-cited independent third-party tests of Clearout specifically.
MailCull publishes 91-93% real-world accuracy on mixed lists, refreshed quarterly with full methodology at mailcull.io/methodology:
| Class | MailCull accuracy |
|---|---|
| Consumer (Gmail, Yahoo, Outlook with real local-parts) | ~95% |
| M365 cloud-only managed tenants | ~92% |
| M365 hybrid / federated | 85-90% |
| Catch-all corporate domains | ~80% |
| Mixed bulk lists (typical customer upload) | 91-93% |
We claim what we measure. The methodology, dataset, and per-class accuracy are all public.
Switching from Clearout in 5 minutes
- Sign up for MailCull Free. No credit card. 100 deep-scan checks plus 1,000 list rows for the first month.
- Test on your real list. Take 500-1,000 addresses with a heavy B2B mix. Run them through MailCull and compare to your Clearout verdicts.
- If the verdicts hold up, upgrade to Pro. $19/month flat. Money-back in 30 days if your bounce rate exceeds 3%.
- We match remaining Clearout credits for 30 days. Email us your last invoice.
FAQ
Is MailCull truly free or is there a catch?
100 deep-scan single-checks and 1,000 deep-scan list rows every month, recurring. Quick-scan unlimited. If you need more, Pro is $19/month flat.
Does MailCull do SMTP mailbox verification?
Yes — full SMTP probing with STARTTLS opportunistic upgrade, FCrDNS-matched EHLO, IPv6 dual-stack support, and a per-MX rate limiter. Plus the M365 HTTP enumeration cascade. Documented at mailcull.io/methodology.
What if I need ESP integrations Clearout has and MailCull does not?
Use Zapier or Make to bridge MailCull's API to your ESP today. Native integrations ship Q2-Q3 2026. If your workflow requires same-day native HubSpot or Mailchimp sync, Clearout is the right answer until our integrations land.
Does the free tier API include the evidence chain?
Yes. The full 20-code evidence chain is in every API response, on every tier including Free.
The bottom line
If you are looking for a free Clearout alternative because of slider-based pricing, opaque verdicts, or a lack of recurring free volume — MailCull is built for those reasons.
Start free with 100 deep-scan checks per month, no credit card. Or paste an email into the free single-email checker right now to see the evidence chain.
For the deeper comparison, the full MailCull vs Clearout side-by-side covers pricing, accuracy data, and the feature parity table.